Network Working Group L. McIntyre
Request for Comments: 2880 Xerox Corporation
Category: Informational G. Klyne
Content Technologies
August 2000
Network Working Group L. McIntyre
Request for Comments: 2880 Xerox Corporation
Category: Informational G. Klyne
Content Technologies
August 2000
Internet Fax T.30 Feature Mapping
Internet传真T.30功能映射
Status of this Memo
本备忘录的状况
This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.
本备忘录为互联网社区提供信息。它没有规定任何类型的互联网标准。本备忘录的分发不受限制。
Copyright Notice
版权公告
Copyright (C) The Internet Society (2000). All Rights Reserved.
版权所有（C）互联网协会（2000年）。版权所有。
Abstract
摘要
This document describes how to map Group 3 fax capability identification bits, described in ITU T.30 [6], into the Internet fax feature schema described in "Content feature schema for Internet fax" [4].
本文件描述了如何将ITU T.30[6]中描述的第3组传真能力识别位映射到“互联网传真的内容特征模式”[4]中描述的互联网传真特征模式中。
This is a companion to the fax feature schema document [4], which itself defines a profile of the media feature registration mechanisms [1,2,3], for use in performing capability identification between extended Internet fax systems [5].
这是传真功能模式文件[4]的配套文件，该文件本身定义了媒体功能注册机制的配置文件[1,2,3]，用于在扩展互联网传真系统之间执行功能识别[5]。
Table of Contents
目录
1. Introduction .............................................3
1.1 Organization of this document ........................3
1.2 Terminology and document conventions .................3
1.3 Discussion of this document ..........................4
2. Combining feature tags ...................................4
2.1 Relationship to Group 3 fax ..........................5
2.2 Feature set descriptions .............................5
2.3 Examples .............................................5
2.3.1 Data resource example ............................6
2.3.2 Recipient capabilities example ...................6
3. Survey of media-related T.30 capability bits .............6
3.1 DIS/DTC bit 15 (resolution) ..........................6
3.2 DIS/DTC bit 16 (MR coding) ...........................7
3.3 DIS/DTC bits 17,18 (width) ...........................7
3.4 DIS/DTC bits 19,20 (length) ..........................7
1. Introduction .............................................3
1.1 Organization of this document ........................3
1.2 Terminology and document conventions .................3
1.3 Discussion of this document ..........................4
2. Combining feature tags ...................................4
2.1 Relationship to Group 3 fax ..........................5
2.2 Feature set descriptions .............................5
2.3 Examples .............................................5
2.3.1 Data resource example ............................6
2.3.2 Recipient capabilities example ...................6
3. Survey of media-related T.30 capability bits .............6
3.1 DIS/DTC bit 15 (resolution) ..........................6
3.2 DIS/DTC bit 16 (MR coding) ...........................7
3.3 DIS/DTC bits 17,18 (width) ...........................7
3.4 DIS/DTC bits 19,20 (length) ..........................7
3.5 DIS/DTC bit 31 (MMR coding) ..........................7
3.6 DIS/DTC bit 36 (JBIG multi-level coding) .............8
3.7 DIS/DTC bit 37 (plane interleave) ....................8
3.8 DIS/DTC bits 41,42,43 (resolution) ...................8
3.9 DIS/DTC bits 44,45 (preferred units) .................9
3.10 DIS/DTC bit 68 (JPEG) ...............................9
3.11 DIS/DTC bit 69 (colour) .............................9
3.12 DIS/DTC bit 71 (bits/sample) .......................10
3.13 DIS/DTC bit 73 (no subsampling) ....................10
3.14 DIS/DTC bit 74 (custom illuminant) .................10
3.15 DIS/DTC bit 75 (custom gamut) ......................10
3.16 DIS/DTC bits 76,77 (paper size) ....................11
3.17 DIS/DTC bit 78 (JBIG bi-level coding) ..............11
3.18 DIS/DTC bit 79 (JBIG stripe size) ..................11
3.19 DIS/DTC bit 92,93,94 (MRC maximum functional mode) .11
3.20 DIS/DTC bit 95 (MRC stripe size) ...................12
3.21 DIS/DTC bit 97 (resolution) ........................12
3.22 DIS/DTC bit 98 (resolution) ........................12
4. Summary of T.30 capability dependencies .................12
4.1 Image coding ........................................13
4.1.1 Bi-level coding .................................13
4.1.2 Multi-level coding ..............................14
4.1.3 MRC format ......................................14
4.2 Resolution and units ................................15
4.3 Colour capabilities .................................17
4.4 Document size .......................................18
5. Mapping T.30 capabilities to fax feature schema .........18
5.1 Image coding ........................................20
5.1.1 Bi-level coding .................................20
5.1.2 Multi-level coding ..............................21
5.1.3 MRC format ......................................23
5.2 Resolution and units ................................23
5.3 Colour capabilities .................................24
5.4 Document size .......................................26
6. Examples ................................................26
6.1 Common black-and-white fax machine ..................27
6.1.1 Corresponding Internet fax capabilities .........29
6.2 Full-featured color fax machine .....................30
7. Security Considerations .................................34
8. Acknowledgements ........................................34
9. References ..............................................34
10. Authors' Addresses .....................................36
Full Copyright Statement ...................................37
3.5 DIS/DTC bit 31 (MMR coding) ..........................7
3.6 DIS/DTC bit 36 (JBIG multi-level coding) .............8
3.7 DIS/DTC bit 37 (plane interleave) ....................8
3.8 DIS/DTC bits 41,42,43 (resolution) ...................8
3.9 DIS/DTC bits 44,45 (preferred units) .................9
3.10 DIS/DTC bit 68 (JPEG) ...............................9
3.11 DIS/DTC bit 69 (colour) .............................9
3.12 DIS/DTC bit 71 (bits/sample) .......................10
3.13 DIS/DTC bit 73 (no subsampling) ....................10
3.14 DIS/DTC bit 74 (custom illuminant) .................10
3.15 DIS/DTC bit 75 (custom gamut) ......................10
3.16 DIS/DTC bits 76,77 (paper size) ....................11
3.17 DIS/DTC bit 78 (JBIG bi-level coding) ..............11
3.18 DIS/DTC bit 79 (JBIG stripe size) ..................11
3.19 DIS/DTC bit 92,93,94 (MRC maximum functional mode) .11
3.20 DIS/DTC bit 95 (MRC stripe size) ...................12
3.21 DIS/DTC bit 97 (resolution) ........................12
3.22 DIS/DTC bit 98 (resolution) ........................12
4. Summary of T.30 capability dependencies .................12
4.1 Image coding ........................................13
4.1.1 Bi-level coding .................................13
4.1.2 Multi-level coding ..............................14
4.1.3 MRC format ......................................14
4.2 Resolution and units ................................15
4.3 Colour capabilities .................................17
4.4 Document size .......................................18
5. Mapping T.30 capabilities to fax feature schema .........18
5.1 Image coding ........................................20
5.1.1 Bi-level coding .................................20
5.1.2 Multi-level coding ..............................21
5.1.3 MRC format ......................................23
5.2 Resolution and units ................................23
5.3 Colour capabilities .................................24
5.4 Document size .......................................26
6. Examples ................................................26
6.1 Common black-and-white fax machine ..................27
6.1.1 Corresponding Internet fax capabilities .........29
6.2 Full-featured color fax machine .....................30
7. Security Considerations .................................34
8. Acknowledgements ........................................34
9. References ..............................................34
10. Authors' Addresses .....................................36
Full Copyright Statement ...................................37
This document describes how to map Group 3 fax capability identification bits, described in ITU T.30 [6], into the Internet fax feature schema described in "Content feature schema for Internet fax" [4].
本文件描述了如何将ITU T.30[6]中描述的第3组传真能力识别位映射到“互联网传真的内容特征模式”[4]中描述的互联网传真特征模式中。
This is a companion to the fax feature schema document [4], which itself defines a profile of the media feature registration mechanisms [1,2,3], for use in performing capability identification between extended Internet fax systems [5].
这是传真功能模式文件[4]的配套文件，该文件本身定义了媒体功能注册机制的配置文件[1,2,3]，用于在扩展互联网传真系统之间执行功能识别[5]。
Section 2 introduces the mechanisms that combine feature tag constraints to describe complex recipient capabilities.
第2节介绍了结合功能标签约束来描述复杂收件人功能的机制。
Section 3 surveys Group 3 fax (T.30) capability bits that relate to media handling capabilities.
第3节调查与媒体处理能力相关的第3组传真（T.30）能力位。
Section 4 describes the dependencies between Group 3 fax (T.30) capability bits. These are presented in a decision table format [16] with descriptive text in place of the action bodies.
第4节描述了第3组传真（T.30）功能位之间的依赖关系。它们以决策表格式[16]呈现，用描述性文本代替行动机构。
Section 5 describes a formal mechanism for converting Group 3 fax (T.30) capability masks to fax feature schema statements. The conversion process is driven by the decision tables introduced previously, using fax feature schema statements and combining rules in the action bodies.
第5节描述了将第3组传真（T.30）功能掩码转换为传真功能模式语句的正式机制。转换过程由前面介绍的决策表驱动，使用fax feature schema语句并结合动作体中的规则。
Section 6 presents an example of a Group 3 fax (T.30) capability mask, and uses the formal mechanism described previously to convert that into a corresponding fax feature schema statement.
第6节给出了第3组传真（T.30）功能掩码的示例，并使用前面描述的正式机制将其转换为相应的传真功能模式语句。
eifax system is used to describe any software, device or combination of these that conforms to the specification "Extended Facsimile Using Internet Mail" [5].
eifax系统用于描述符合规范“使用互联网邮件的扩展传真”[5]的任何软件、设备或其组合。
Feature is used as defined in [15]. (See also section 2 of this memo.)
按照[15]中的定义使用特征。（另请参见本备忘录第2节。）
Feature tag is used as defined in [15]. (See also section 2.)
按照[15]中的定义使用特征标记。（另见第2节。）
Feature collection is used as defined in [2]. (See also section 2.)
按[2]中的定义使用特征集合。（另见第2节。）
Feature set is used as defined in [2]. (See also section 2.)
特征集按[2]中的定义使用。（另见第2节。）
Discussion of this document should take place on the Internet fax mailing list hosted by the Internet Mail Consortium (IMC). Please send comments regarding this document to:
本文件的讨论应在互联网邮件联盟（IMC）托管的互联网传真邮件列表上进行。请将有关本文件的意见发送至：
ietf-fax@imc.org
ietf-fax@imc.org
To subscribe to this list, send a message with the body 'subscribe' to "ietf-fax-request@imc.org".
要订阅此列表，请向“ietf传真”发送一条正文为“订阅”的消息-request@imc.org".
To see what has gone on before you subscribed, please see the mailing list archive at:
要查看订阅前的情况，请访问邮件列表存档：
http://www.imc.org/ietf-fax/
http://www.imc.org/ietf-fax/
A fax document can be described by media features. Any single media feature value can be thought of as just one component of a feature collection that describes some instance of a document (e.g. a printed fax, a displayed image, etc.). Such a feature collection consists of a number of media feature tags (each per [1]) and associated feature values.
传真文档可以通过媒体功能来描述。任何单个媒体特征值都可以看作是描述文档实例（例如打印传真、显示图像等）的特征集合的一个组件。这样的特征集合由多个媒体特征标签（每[1]）和相关特征值组成。
A feature set contains a number of feature collections. Thus, a feature set can describe a number of different fax document instances. These can correspond to different treatments of a single document (e.g. different resolutions used for printing a given fax), a number of different documents subjected to a common treatment (e.g. the range of different images that can be rendered on a given display), or some combination of these (see examples below).
要素集包含多个要素集合。因此，功能集可以描述许多不同的传真文档实例。这些可以对应于单个文档的不同处理方式（例如，用于打印给定传真的不同分辨率）、经过共同处理的多个不同文档（例如，可以在给定显示器上渲染的不同图像的范围）或这些的一些组合（参见下面的示例）。
Thus, a description of a feature set can describe the rendering requirements of a fax document or the capabilities of a receiving eifax system.
因此，特征集的描述可以描述传真文档的呈现要求或接收传真系统的能力。
A "feature tag" can be compared with a single bit in a T.30 DCS frame, describing a specific attribute of a specific fax document.
“功能标签”可与T.30 DCS框架中的单个位进行比较，用于描述特定传真文档的特定属性。
A "feature collection" corresponds to a complete T.30 DCS frame, describing a range of attributes of a specific fax document.
“功能集合”对应于完整的T.30 DCS框架，描述特定传真文档的一系列属性。
A "feature set" corresponds to a DIS or DTC frame, describing the range of document attributes that can be accepted by a given fax machine.
“功能集”对应于DIS或DTC框架，描述给定传真机可接受的文档属性范围。
Within T.30 DIS/DTC frames, dependencies between the various capabilities are implicit in the definitions of the capabilities. E.g. multi-level coding (DIS/DTC bit 68) requires support for 200*200dpi resolution (DIS/DTC bit 15). In the feature set description framework used by eifax systems [1,2,3,4] such dependencies between different features are expressed explicitly. Later sections of this memo describe how the implicit dependencies of T.30 are expressed using the media feature set notation.
在T.30 DIS/DTC框架内，各种能力之间的依赖关系隐含在能力定义中。例如，多级编码（DIS/DTC位68）需要支持200*200dpi分辨率（DIS/DTC位15）。在eifax系统[1,2,3,4]使用的功能集描述框架中，明确表示了不同功能之间的依赖关系。本备忘录后面的章节将描述如何使用媒体功能集符号表示T.30的隐式依赖关系。
The general approach to describing feature sets, described more fully in [2], is to use functions ("predicates") that, when applied to a feature collection value, yield a Boolean value that is TRUE if the feature collection describes an acceptable fax document instance, otherwise FALSE.
描述要素集的一般方法（在[2]中有更详细的描述）是使用函数（“谓词”），当应用于要素集合值时，如果要素集合描述了可接受的传真文档实例，则生成布尔值，否则为FALSE。
P(F)
P(F) = TRUE <- : -> P(F) = FALSE
:
+----------:----------+ This box represents some
| : | universe of fax documents (F)
| Included : Excluded | from which some acceptable subset
| : | is selected by the predicate P.
+----------:----------+
:
P(F)
P(F) = TRUE <- : -> P(F) = FALSE
:
+----------:----------+ This box represents some
| : | universe of fax documents (F)
| Included : Excluded | from which some acceptable subset
| : | is selected by the predicate P.
+----------:----------+
:
In the examples below the following notation is used:
在以下示例中，使用以下符号：
(x ? y) tests feature tag 'x' for some relationship with value 'y'.
（x？y）测试特征标签“x”与值“y”的关系。
(| p1 p2 ... pn ) represents the logical-OR of predicates 'p1', 'p2' up to 'pn'.
（| p1 p2…pn）表示谓词“p1”、“p2”到“pn”的逻辑OR。
(& p1 p2 ... pn ) represents the logical-AND of predicates 'p1', 'p2' up to 'pn'.
（&p1 p2…pn）表示谓词“p1”、“p2”到“pn”的逻辑AND。
The following expression uses the syntax of [2] to describe a data resource that can be displayed either: (a) as a 750x500 pixel image using 15 colours, or (b) at 150dpi on an A4 page.
以下表达式使用[2]的语法来描述可以显示的数据资源：（a）使用15种颜色显示为750x500像素图像，或（b）在A4页面上显示为150dpi。
(| (& (pix-x=750) (pix-y=500) (color=15) )
(& (dpi>=150) (papersize=A4) ) )
(| (& (pix-x=750) (pix-y=500) (color=15) )
(& (dpi>=150) (papersize=A4) ) )
The following expression describes a receiving system that has: (a) a screen capable of displaying 640*480 pixels and 16 million colours (24 bits per pixel), 800*600 pixels and 64 thousand colours (16 bits per pixel) or 1024*768 pixels and 256 colours (8 bits per pixel), or (b) a printer capable of rendering 300dpi on A4 paper.
以下表达式描述了一种接收系统，其具有：（a）能够显示640*480像素和1600万颜色（每像素24位）、800*600像素和64000颜色（每像素16位）或1024*768像素和256颜色（每像素8位）的屏幕，或（b）能够在A4纸上呈现300dpi的打印机。
(| (& (| (& (pix-x<=640) (pix-y<=480) (color<=16777216) )
(& (pix-x<=800) (pix-y<=600) (color<=65535) )
(& (pix-x<=1024) (pix-y<=768) (color<=256) ) )
(media=screen) )
(& (dpi=300)
(media=stationery) (papersize=A4) ) )
(| (& (| (& (pix-x<=640) (pix-y<=480) (color<=16777216) )
(& (pix-x<=800) (pix-y<=600) (color<=65535) )
(& (pix-x<=1024) (pix-y<=768) (color<=256) ) )
(media=screen) )
(& (dpi=300)
(media=stationery) (papersize=A4) ) )
The following sections refer to T.30 DIS/DTC bits identified and described in Table 2/T.30 and accompanying notes [6]. Bit numbers that are not referenced below are considered to be not related to media features, hence not relevant to the Internet fax feature schema.
以下章节涉及表2/T.30和随附注释[6]中确定和描述的T.30 DIS/DTC位。以下未引用的位号被视为与媒体功能无关，因此与Internet传真功能模式无关。
NOTE: some of the DIS/DTC bits identified below are documented in revisions of the T.30 specification that may be not yet publicly available from the ITU.
注：以下确定的一些DIS/DTC位记录在T.30规范的修订版中，该修订版可能尚未从ITU公开获得。
All Group 3 fax systems are required to support a basic resolution of 200*100dpi (dots per inch) or 8*3.85dpmm (dots per millimetre).
所有第3组传真系统都需要支持200*100dpi（每英寸点数）或8*3.85dpmm（每毫米点数）的基本分辨率。
Setting this bit indicates additional support for 200*200dpi or 8*7.7dpmm.
设置此位表示对200*200dpi或8*7.7dpmm的额外支持。
For multi-level images, 200*200dpi is the basic resolution, and this bit must be set. The other basic resolution options apply to bi-level images only.
对于多级图像，200*200dpi是基本分辨率，必须设置此位。其他基本分辨率选项仅适用于双层图像。
See also: bits 44,45.
另见：第44、45位。
All Group 3 fax systems are required to support Modified Huffman (MH) 1-dimensional coding for bi-level images. (A bi-level image is one with just two pixel states such as black and white, as opposed to a grey-scale or colour image.)
所有第3组传真系统都需要支持用于双层图像的改进哈夫曼（MH）一维编码。（与灰度或彩色图像相反，二级图像只有两个像素状态，如黑色和白色。）
Setting this bit indicates additional support for Modified Read (MR) 2-dimensional coding for bi-level images.
设置此位表示对双层图像的修改读取（MR）二维编码的额外支持。
Both MH and MR coding are described in ITU T.4 [7].
MH和MR编码在ITU T.4[7]中均有描述。
See also: bits 31,78,79.
另见：第31、78、79位。
All Group 3 fax systems are required to support 215mm paper width. These bits can be set to indicate additional support for 255mm and 303mm paper widths.
所有第3组传真系统都需要支持215mm的纸张宽度。这些位可以设置为表示额外支持255mm和303mm纸张宽度。
See also: bits 76,77.
另见：第76、77位。
All Group 3 fax systems are required to support 297mm paper length. These bits can be set to indicate additional support for 364mm and unlimited paper lengths.
所有第3组传真系统都需要支持297mm的纸张长度。这些位可以设置为表示对364mm和无限纸张长度的额外支持。
See also: bits 76,77.
另见：第76、77位。
Setting this bit indicates support for Modified Modified Read (MMR) 2-dimensional coding for bi-level images, in addition to the required support for MH coding.
设置此位表示除了对MH编码的必要支持外，还支持对双层图像的修改读取（MMR）二维编码。
MMR coding is described in ITU T.6 [8].
MMR编码在ITU T.6[8]中进行了描述。
See also: bits 16,78,79.
另见：第16、78、79位。
If multi-level images are to be handled, support for JPEG coding is required (i.e. bit 68 must be set). Setting bit 36 indicates additional support for JBIG lossless coding of multi-level images.
如果要处理多级图像，则需要支持JPEG编码（即必须设置位68）。设置位36表示对JBIG多级图像无损编码的额外支持。
JBIG coding for multi-level images is described in ITU T.43 [10] and T.4 Annex G [7].
ITU T.43[10]和T.4附录G[7]中描述了多级图像的JBIG编码。
See also: bits 68,69.
另见：第68、69位。
Setting this bit indicates support for plane interleave for JBIG-coded multi-level images in addition to stripe interleave, which is standard for JBIG multi-level images.
设置此位表示除条纹交织外，还支持JBIG编码多级图像的平面交织，条纹交织是JBIG多级图像的标准。
JBIG coding for multi-level images is described in ITU T.43 [10] and T.4 Annex G [7].
ITU T.43[10]和T.4附录G[7]中描述了多级图像的JBIG编码。
See also: bit 36.
另见：第36位。
Setting these bits indicates support for resolutions in addition to 200*100dpi and 200*200dpi, or 8*3.85dpmm and 8*7.7dpmm. (Or in addition to the basic 200*200dpi resolution when using a multi-level image mode.)
设置这些位表示除支持200*100dpi和200*200dpi或8*3.85dpmm和8*7.7dpmm外，还支持分辨率。（或者在使用多级图像模式时，除了基本的200*200dpi分辨率之外。）
Bit 41 indicates support for 8*15.4dpmm bi-level images (independently of the settings of bits 44 and 45).
位41表示支持8*15.4dpmm双层图像（独立于位44和45的设置）。
Bit 42 indicates support for 300*300dpi bi-level images (independently of the settings of bits 44 and 45). Also applies to multi-level images or MRC mask if bit 97 is set.
位42表示支持300*300dpi双电平图像（独立于位44和45的设置）。如果设置了位97，也适用于多级图像或MRC掩码。
Bit 43 indicates support for 400*400dpi and/or 16*15.4dpmm bi-level images, depending upon the settings of bits 44 and 45. Also applies to multi-level images or MRC mask if bit 97 is set.
位43表示支持400*400dpi和/或16*15.4dpmm双电平图像，具体取决于位44和45的设置。如果设置了位97，也适用于多级图像或MRC掩码。
See also: bits 15,44,45,97.
另见：第15、44、45、97位。
These bits are used to indicate the preferred resolution units for received images. Because the exact resolution and x/y pixel density measures in dpi or dpmm are slightly different, some image size and aspect ratio distortion may occur if the sender and receiver use different units.
这些位用于指示接收图像的首选分辨率单位。由于dpi或dpmm中的精确分辨率和x/y像素密度测量值略有不同，因此，如果发送方和接收方使用不同的单位，可能会出现一些图像大小和纵横比失真。
Even when sender and recipient have different preferred units, image transfer must be accomplished. For most fax uses, the dpi and dpmm measurements are sufficiently close to each other that the difference is not noticed.
即使发送方和接收方有不同的首选单元，也必须完成图像传输。对于大多数传真使用，dpi和dpmm测量值彼此非常接近，因此不会注意到差异。
The preferred units setting affects the detailed interpretation of the following resolutions:
首选单位设置会影响以下分辨率的详细解释：
dpi dpmm (dpi equivalent)
--- ----
Base 200*100 8*3.85 204*98
Bit 15 200*200 8*7.7 204*196
Bit 43 400*400 16*15.4 408*391
dpi dpmm (dpi equivalent)
--- ----
Base 200*100 8*3.85 204*98
Bit 15 200*200 8*7.7 204*196
Bit 43 400*400 16*15.4 408*391
But terminals are required to accept the inch- and metric-based measures given above as equivalent, distorting the image if necessary to accommodate the differences.
但是终端必须接受上面给出的基于英寸和米制的测量值作为等效值，必要时会扭曲图像以适应差异。
See also: bits 15, 43
另见：第15、43位
This bit indicates support for JPEG coding of multi-level images.
此位表示支持多级图像的JPEG编码。
JPEG coding for multi-level images is described in ITU T.81 [12] and T.4 Annex E [7].
ITU T.81[12]和T.4附录E[7]中描述了多级图像的JPEG编码。
See also: bits 15,69,73
另见：第15、69、73位
This bit indicates support for colour images, in addition to just grey-scale.
此位表示除灰度外，还支持彩色图像。
Both grey-scale and colour require multi-level coding. The difference is that grey is single component while colour is multi-component.
灰度和颜色都需要多级编码。区别在于灰色是单组分，而颜色是多组分。
See also: bits 36,68,73.
另见：第36、68、73位。
Standard support for multi-level images uses 8 bits per sample. Setting this bit indicates additional support for 12 bits per sample.
对多级图像的标准支持使用每个样本8位。设置此位表示对每个样本12位的额外支持。
For a grey-scale multi-level image, there is just one sample per pixel, giving 256 or 4096 possible pixel values. For a full colour multi-level image there are three samples per pixel, giving 256^3 (16777216) or 4096^3 (6871946736) possible values.
对于灰度多级图像，每个像素只有一个样本，给出256或4096个可能的像素值。对于全彩多级图像，每个像素有三个样本，给出256^3（16777216）或4096^3（6871946736）可能的值。
When related to a mapped colour image, bit 71 also affects the maximum number of entries in the mapping table: when it is reset, up to 4096 different pixel values can be used; when set, up to 65536 different values can be used.
当与映射的彩色图像相关时，位71还影响映射表中的最大条目数：复位时，最多可使用4096个不同的像素值；设置时，最多可使用65536个不同的值。
See also: bit 68.
另见：第68位。
Standard support for JPEG-coded multi-level images uses 4:1:1 chrominance subsampling. That is, for each 4 luminance samples in the image data there is a single chrominance sample.
JPEG编码多级图像的标准支持使用4:1:1色度子采样。即，对于图像数据中的每4个亮度样本，存在单个色度样本。
Setting this bit indicates that JPEG-coded colour images without subsampling can also be supported. This is not applicable to JBIG coding (bit 36).
设置此位表示也支持不带子采样的JPEG编码彩色图像。这不适用于JBIG编码（位36）。
See also: bits 68,69.
另见：第68、69位。
Standard support for multi-level images requires use of D50 illuminant. Setting this bit indicates that a custom illuminant also can be supported for multi-level images (both grey-scale and colour). Details of the custom illuminant are contained in the image data.
对多级图像的标准支持要求使用D50光源。设置此位表示也可以为多级图像（灰度和颜色）支持自定义光源。自定义光源的详细信息包含在图像数据中。
Use of a custom illuminant with multi-level images is described in ITU T.4 Annex E [7].
ITU T.4附录E[7]中描述了具有多级图像的定制光源的使用。
See also: bits 36,68.
另见：第36、68位。
Standard support for a default colour gamut is required for multi-level images. Setting this bit indicates that a custom gamut also can be supported for multi-level images (both grey-scale and colour). Details of the custom gamut are contained in the image data.
多级图像需要默认色域的标准支持。设置此位表示也可以为多级图像（灰度和颜色）支持自定义色域。自定义色域的详细信息包含在图像数据中。
The default gamut (L*=[0,100], a*=[-85, 85], b* = [-75, 125]), and
use of a custom gamut with multi-level images is described in ITU
T.42 [9] and T.4 Annex E [7].
The default gamut (L*=[0,100], a*=[-85, 85], b* = [-75, 125]), and
use of a custom gamut with multi-level images is described in ITU
T.42 [9] and T.4 Annex E [7].
See also: bits 36,68.
另见：第36、68位。
All Group 3 faxes are required to support A4 paper size. These bits can be set to indicate additional support for North American letter and legal paper sizes.
所有第3组传真都需要支持A4纸张大小。这些位可以设置为表示对北美字母和法律纸张尺寸的额外支持。
See also: bits 17,18,19,20.
另见：第17、18、19、20位。
Setting bit 78 indicates support for JBIG coding of bi-level images (using T.85 encoding rules), in addition to the required support for MH coding.
设置位78表示除MH编码所需的支持外，还支持双层图像的JBIG编码（使用T.85编码规则）。
JBIG coding of bi-level images is described in ITU T.85 [14].
ITU T.85[14]中描述了双层图像的JBIG编码。
See also: bits 16,31,79.
另见：第16、31、79位。
Setting bit 79 (along with bit 78) indicates support for the 'LO' option with JBIG coded bi-level images. Basic bi-level JBIG coding uses 128 lines per stripe; the 'LO' option allows other stripe sizes to be used.
设置位79（连同位78）表示支持JBIG编码双电平图像的“LO”选项。基本的两级JBIG编码每个条带使用128行；“LO”选项允许使用其他条纹尺寸。
The stripe size is used for all stripes except the last, which may have fewer lines than the indicated value.
条带大小用于除最后一条以外的所有条带，该条带的行数可能小于指定值。
JBIG coding of bi-level images is described in ITU T.85 [14].
ITU T.85[14]中描述了双层图像的JBIG编码。
See also: bits 16,31,78.
另见：第16、31、78位。
If these bits are all zero, then Mixed Raster Content (MRC) coding is not supported. Otherwise, they represent a number in the range 1-7 that indicates an MRC maximum functional mode.
如果这些位均为零，则不支持混合光栅内容（MRC）编码。否则，它们表示1-7范围内的数字，表示MRC最大功能模式。
MRC coding of images is described in ITU T.44 [11] and T.4 Annex H [17].
ITU T.44[11]和T.4附录H[17]中描述了图像的MRC编码。
See also: bits 68,95.
另见：第68、95位。
Standard support for MRC uses a maximum stripe size of 256 lines. When this bit is set, the maximum stripe size is a full page.
MRC的标准支持使用256行的最大条带大小。设置此位时，最大条带大小为整页。
This bit is meaningful only if bits 92-94 indicate an MRC coding capability. MRC coding of images is described in ITU T.44 [11] and T.4 Annex H [17].
只有当位92-94表示MRC编码能力时，该位才有意义。ITU T.44[11]和T.4附录H[17]中描述了图像的MRC编码。
See also: bits 92,93,94.
另见：第92、93、94位。
Setting this bit indicates that the additional resolutions indicated by bits 42 and 43 may be used for multi-level images and any MRC mask layer.
设置该位表示位42和43指示的附加分辨率可用于多级图像和任何MRC掩模层。
When this bit is set, bit 42 implies 300dpi and bit 43 implies 400dpi for multi-level or MRC mask layer images (irrespective of the preferred units indicated by bits 44 and 45).
当设置该位时，位42表示多电平或MRC屏蔽层图像的300dpi，位43表示400dpi（与位44和45指示的首选单位无关）。
See also: bits 42,43,68.
另见：第42、43、68位。
Setting this bit indicates that the additional resolution 100*100dpi may be used for multi-level images.
设置此位表示附加分辨率100*100dpi可用于多级图像。
NOTE: 100dpi is not used for bi-level images, including the MRC mask layer.
注：100dpi不用于双层图像，包括MRC掩模层。
See also: bit 36,68,92-94.
另见：第36、68、92-94位。
This section contains a number of decision tables that indicate the allowable combinations of T.30 DIS/DTC mask bits.
本节包含许多决策表，指示T.30 DIS/DTC掩码位的允许组合。
Within the decision table bodies, the following symbols are use to indicate values of T.30 DIS/DTC bits:
在判定表体中，以下符号用于指示T.30 DIS/DTC位的值：
0 = bit set to '0'
1 = bit set to '1'
x = don't care bit value: may be '0' or '1'
*0 = bit must be '0' ('1' is invalid in given combination)
*1 = bit must be '1' ('0' is invalid in given combination)
# = bits in row combined to form a numeric value
0 = bit set to '0'
1 = bit set to '1'
x = don't care bit value: may be '0' or '1'
*0 = bit must be '0' ('1' is invalid in given combination)
*1 = bit must be '1' ('0' is invalid in given combination)
# = bits in row combined to form a numeric value
MH coding is required as a minimum for Group 3 fax operation.
第3组传真操作至少需要MH编码。
<------- T.30 bits --------->
15|16|31|36|37|68|69|73|78|79||Description
--+--+--+--+--+--+--+--+--+--++---------------------------------------
x| 0| 0| | | | | | 0| 0||Compression = [MH]
x| 1| 0| | | | | | 0| 0||Compression = [MH,MR]
x| 0| 1| | | | | | 0| 0||Compression = [MH,MMR]
x| 1| 1| | | | | | 0| 0||Compression = [MH,MR,MMR]
x| 0| 0| | | | | | 1| 0||Compression = [MH,T.85]
x| 1| 0| | | | | | 1| 0||Compression = [MH,MR,T.85]
x| 0| 1| | | | | | 1| 0||Compression = [MH,MMR,T.85]
x| 1| 1| | | | | | 1| 0||Compression = [MH,MR,MMR,T.85]
x| 0| 0| | | | | |*1| 1||Compression = [MH,T.85,T.85LO]
x| 1| 0| | | | | |*1| 1||Compression = [MH,MR,T.85,T.85LO]
x| 0| 1| | | | | |*1| 1||Compression = [MH,MMR,T.85,T.85LO]
x| 1| 1| | | | | |*1| 1||Compression = [MH,MR,MMR,T.85,T.85LO]
| | | | | | | | | ||MH = 1-D per T.4
| | | | | | | | | ||MR = 2-D per T.4
| | | | | | | | | ||MMR = 2-D per T.6
| | | | | | | | | ||T.85 = Basic JBIG per T.85
| | | | | | | | | ||T.85LO = Optional LO with T.85/JBIG
| | | | | | | | | ||(Basic JBIG is 128 lines/stripe; LO
| | | | | | | | | || allows other stripe sizes to be used)
--+--+--+--+--+--+--+--+--+--++---------------------------------------
<------- T.30 bits --------->
15|16|31|36|37|68|69|73|78|79||Description
--+--+--+--+--+--+--+--+--+--++---------------------------------------
x| 0| 0| | | | | | 0| 0||Compression = [MH]
x| 1| 0| | | | | | 0| 0||Compression = [MH,MR]
x| 0| 1| | | | | | 0| 0||Compression = [MH,MMR]
x| 1| 1| | | | | | 0| 0||Compression = [MH,MR,MMR]
x| 0| 0| | | | | | 1| 0||Compression = [MH,T.85]
x| 1| 0| | | | | | 1| 0||Compression = [MH,MR,T.85]
x| 0| 1| | | | | | 1| 0||Compression = [MH,MMR,T.85]
x| 1| 1| | | | | | 1| 0||Compression = [MH,MR,MMR,T.85]
x| 0| 0| | | | | |*1| 1||Compression = [MH,T.85,T.85LO]
x| 1| 0| | | | | |*1| 1||Compression = [MH,MR,T.85,T.85LO]
x| 0| 1| | | | | |*1| 1||Compression = [MH,MMR,T.85,T.85LO]
x| 1| 1| | | | | |*1| 1||Compression = [MH,MR,MMR,T.85,T.85LO]
| | | | | | | | | ||MH = 1-D per T.4
| | | | | | | | | ||MR = 2-D per T.4
| | | | | | | | | ||MMR = 2-D per T.6
| | | | | | | | | ||T.85 = Basic JBIG per T.85
| | | | | | | | | ||T.85LO = Optional LO with T.85/JBIG
| | | | | | | | | ||(Basic JBIG is 128 lines/stripe; LO
| | | | | | | | | || allows other stripe sizes to be used)
--+--+--+--+--+--+--+--+--+--++---------------------------------------
Note: When 37, 69, 73, 79 and 95 are set to "1", the feature represented by "0" is also available. Example: If plane interleave is available then stripe interleave is also available.
注：当37、69、73、79和95设置为“1”时，“0”表示的功能也可用。示例：如果平面交织可用，则条纹交织也可用。
<------- T.30 bits --------->
15|16|31|36|37|68|69|73|78|79||Description
--+--+--+--+--+--+--+--+--+--++---------------------------------------
x| | |*0| x| 0| x| x| | ||No grey or colour (no T.43 or JPEG)
*1| | | 0| x| 1| 0| x| | ||JPEG, grey scale only
*1| | | 0| x| 1| 1| 0| | ||JPEG, full colour, subsampling
*1| | | 0| x| 1| 1| 1| | ||JPEG, full colour, no subsampling
*1| | | 1| 0|*1| 0| x| | ||T.43, JPEG, grey only, stripe i/l
*1| | | 1| 1|*1| 0| x| | ||T.43, JPEG, grey only, plane i/l
*1| | | 1| 0|*1| 1| 0| | ||T.43, JPEG, colour, stripe i/l, s/s
*1| | | 1| 0|*1| 1| 1| | ||T.43, JPEG, colour, stripe i/l, no s/s
*1| | | 1| 1|*1| 1| 0| | ||T.43, JPEG, colour, plane i/l, s/s
*1| | | 1| 1|*1| 1| 1| | ||T.43, JPEG, colour, plane i/l, no s/s
| | | | | | | | | ||'s/s' is 4:1:1 L*:a*:b* subsampling
| | | | | | | | | ||'No s/s' is 1:1:1 L*:a*:b* subsampling
| | | | | | | | | ||'stripe i/l' is stripe interleave
| | | | | | | | | ||'plane i/l' is full-plane interleave
--+--+--+--+--+--+--+--+--+--++---------------------------------------
<------- T.30 bits --------->
15|16|31|36|37|68|69|73|78|79||Description
--+--+--+--+--+--+--+--+--+--++---------------------------------------
x| | |*0| x| 0| x| x| | ||No grey or colour (no T.43 or JPEG)
*1| | | 0| x| 1| 0| x| | ||JPEG, grey scale only
*1| | | 0| x| 1| 1| 0| | ||JPEG, full colour, subsampling
*1| | | 0| x| 1| 1| 1| | ||JPEG, full colour, no subsampling
*1| | | 1| 0|*1| 0| x| | ||T.43, JPEG, grey only, stripe i/l
*1| | | 1| 1|*1| 0| x| | ||T.43, JPEG, grey only, plane i/l
*1| | | 1| 0|*1| 1| 0| | ||T.43, JPEG, colour, stripe i/l, s/s
*1| | | 1| 0|*1| 1| 1| | ||T.43, JPEG, colour, stripe i/l, no s/s
*1| | | 1| 1|*1| 1| 0| | ||T.43, JPEG, colour, plane i/l, s/s
*1| | | 1| 1|*1| 1| 1| | ||T.43, JPEG, colour, plane i/l, no s/s
| | | | | | | | | ||'s/s' is 4:1:1 L*:a*:b* subsampling
| | | | | | | | | ||'No s/s' is 1:1:1 L*:a*:b* subsampling
| | | | | | | | | ||'stripe i/l' is stripe interleave
| | | | | | | | | ||'plane i/l' is full-plane interleave
--+--+--+--+--+--+--+--+--+--++---------------------------------------
Multi-level coders, as indicated above, are used for foreground and background images within an MRC-format document. Bi-level codes are used for the mask layer.
如上所述，多级编码器用于MRC格式文档中的前景和背景图像。双层代码用于遮罩层。
<---- T.30 bits ------>
15|92|93|94|95| | | ||Description
--+--+--+--+--+--+--+--++---------------------------------------
x| 0| 0| 0| x| | | ||MRC not accepted
*1| #| #| #| 0| | | ||MRC level, max strip 256 lines
*1| #| #| #| 1| | | ||MRC level, max strip full page
| | | | | | | ||### is MRC performance level (1-7, per T.44)
--+--+--+--+--+--+--+--++---------------------------------------
<---- T.30 bits ------>
15|92|93|94|95| | | ||Description
--+--+--+--+--+--+--+--++---------------------------------------
x| 0| 0| 0| x| | | ||MRC not accepted
*1| #| #| #| 0| | | ||MRC level, max strip 256 lines
*1| #| #| #| 1| | | ||MRC level, max strip full page
| | | | | | | ||### is MRC performance level (1-7, per T.44)
--+--+--+--+--+--+--+--++---------------------------------------
Support for bi-level coding at least one of 200*100dpi or 8*3.85dpmm is required in all cases for Group 3 fax conformance. For multi-level coders (colour/grey) and MRC mask layers the base resolution is 200*200dpi (i.e. bit 15 must be set).
对于第3组传真一致性，在所有情况下，至少需要支持200*100dpi或8*3.85dpmm中的一种双层编码。对于多级编码器（彩色/灰色）和MRC掩模层，基本分辨率为200*200dpi（即必须设置位15）。
When multi-level coders (JPEG or T.43) or MRC are used, only inch-based square resolutions are available. However, the base non-square resolution (i.e. 200x100dpi or 8x3.85dpmm) must still be available as a capability for use with the mandatory bi-level coder (MH). Hence, any references to metric and non-square resolutions in the table below apply only to bi-level coders.
当使用多级编码器（JPEG或T.43）或MRC时，只能使用基于英寸的平方分辨率。但是，基本非平方分辨率（即200x100dpi或8x3.85dpmm）仍必须作为一种功能提供给强制性双电平编码器（MH）。因此，下表中提及的公制和非平方分辨率仅适用于双电平编码器。
When describing MRC capabilities, the complete set of usable resolutions is listed. However, there are some restrictions on their use: (a) 100dpi resolution can be used only with multi-level images, and (b) any multi-level image resolution is required to be an integral sub-multiple of the applicable mask resolution.
在描述MRC功能时，会列出完整的可用分辨率集。但是，它们的使用有一些限制：（a）100dpi分辨率只能用于多级图像，以及（b）任何多级图像分辨率都必须是适用遮罩分辨率的整数倍。
In the following table: dpi = dots per inch dpmm = dots per millimetre
下表中：dpi=每英寸点数dpmm=每毫米点数
Preferred resolutions are indicated here, even though inch- or mm-based units must be accepted, according to the T.30 protocol [6].
尽管根据T.30协议[6]，必须接受基于英寸或毫米的单位，但此处指出了首选分辨率。
<------- T.30 bits ------>
15|41|42|43|44|45|68|97|98||Description
--+--+--+--+--+--+--+--+--++-----------------------------------------
0| | | 0| x| x| | | ||Resolution = base only
| | | | | | | | ||
1| | | 0| 0| 0| | | ||Invalid
1| | | 0| 0| 1| | | ||Resolution = 8*3.85dpmm or 8*7.7dpmm
1| | | 0| 1| 0| | | ||Resolution = 200*100dpi or 200*200dpi
1| | | 0| 1| 1| | | ||Resolution = 8*3.85dpmm or 8*7.7dpmm
| | | | | | | | || or 200*100dpi or 200*200dpi
| | | | | | | | ||
0| | | 1| 0| 0| | | ||Invalid
0| | | 1| 0| 1| | | ||Resolution = 8*3.85dpmm or 16*15.4dpmm
0| | | 1| 1| 0| | | ||Resolution = 200*100dpi or 400*400dpi
0| | | 1| 1| 1| | | ||Resolution = 8*3.85dpmm or 16*15.4dpmm
| | | | | | | | || or 200*100dpi or 400*400dpi
| | | | | | | | ||
1| | | 1| 0| 0| | | ||Invalid
1| | | 1| 0| 1| | | ||Resolution = 8*3.85dpmm or 8*7.7dpmm
| | | | | | | | || or 16*15.4dpmm
1| | | 1| 1| 0| | | ||Resolution = 200*100dpi or 200*200dpi
| | | | | | | | || or 400*400dpi
1| | | 1| 1| 1| | | ||Resolution = 8*7.7dpmm or 8*7.7dpmm
| | | | | | | | || or 16*15.4dpmm
| | | | | | | | || or 200*100dpi or 200*200dpi
| | | | | | | | || or 400*400dpi
--+--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | | | | | | ||Resolutions as above
| 1| | | | | | | ||Also supports 8*15.4dpmm (bi-level only)
| | | | | | | | ||Independent of bits 44,45
--+--+--+--+--+--+--+--+--++-----------------------------------------
| | 0| | | | | | ||Resolutions as above
| | 1| | | | | | ||Also supports 300*300dpi
| | | | | | | | ||Independent of bits 44,45
--+--+--+--+--+--+--+--+--++-----------------------------------------
| | | | | | x| 0| ||Resolutions as above
| | | | | |*1| 1| ||Also 300*300dpi or 400*400dpi (see below)
| | | | | | | | ||(Applies colour, grey-scale or MRC mask)
| | | | | | | | ||(Valid only when bit 42 or 43 is set.)
| | | | | | | | ||(42 => 300dpi, 43=>400dpi)
--+--+--+--+--+--+--+--+--++-----------------------------------------
| | | | | | x| | 0||Resolutions as above
| | | | | |*1| | 1||Also 100*100dpi
| | | | | | | | ||(Applies colour or grey-scale only)
| | | | | | | | ||(Independent of bits 44,45)
--+--+--+--+--+--+--+--+--++-----------------------------------------
<------- T.30 bits ------>
15|41|42|43|44|45|68|97|98||Description
--+--+--+--+--+--+--+--+--++-----------------------------------------
0| | | 0| x| x| | | ||Resolution = base only
| | | | | | | | ||
1| | | 0| 0| 0| | | ||Invalid
1| | | 0| 0| 1| | | ||Resolution = 8*3.85dpmm or 8*7.7dpmm
1| | | 0| 1| 0| | | ||Resolution = 200*100dpi or 200*200dpi
1| | | 0| 1| 1| | | ||Resolution = 8*3.85dpmm or 8*7.7dpmm
| | | | | | | | || or 200*100dpi or 200*200dpi
| | | | | | | | ||
0| | | 1| 0| 0| | | ||Invalid
0| | | 1| 0| 1| | | ||Resolution = 8*3.85dpmm or 16*15.4dpmm
0| | | 1| 1| 0| | | ||Resolution = 200*100dpi or 400*400dpi
0| | | 1| 1| 1| | | ||Resolution = 8*3.85dpmm or 16*15.4dpmm
| | | | | | | | || or 200*100dpi or 400*400dpi
| | | | | | | | ||
1| | | 1| 0| 0| | | ||Invalid
1| | | 1| 0| 1| | | ||Resolution = 8*3.85dpmm or 8*7.7dpmm
| | | | | | | | || or 16*15.4dpmm
1| | | 1| 1| 0| | | ||Resolution = 200*100dpi or 200*200dpi
| | | | | | | | || or 400*400dpi
1| | | 1| 1| 1| | | ||Resolution = 8*7.7dpmm or 8*7.7dpmm
| | | | | | | | || or 16*15.4dpmm
| | | | | | | | || or 200*100dpi or 200*200dpi
| | | | | | | | || or 400*400dpi
--+--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | | | | | | ||Resolutions as above
| 1| | | | | | | ||Also supports 8*15.4dpmm (bi-level only)
| | | | | | | | ||Independent of bits 44,45
--+--+--+--+--+--+--+--+--++-----------------------------------------
| | 0| | | | | | ||Resolutions as above
| | 1| | | | | | ||Also supports 300*300dpi
| | | | | | | | ||Independent of bits 44,45
--+--+--+--+--+--+--+--+--++-----------------------------------------
| | | | | | x| 0| ||Resolutions as above
| | | | | |*1| 1| ||Also 300*300dpi or 400*400dpi (see below)
| | | | | | | | ||(Applies colour, grey-scale or MRC mask)
| | | | | | | | ||(Valid only when bit 42 or 43 is set.)
| | | | | | | | ||(42 => 300dpi, 43=>400dpi)
--+--+--+--+--+--+--+--+--++-----------------------------------------
| | | | | | x| | 0||Resolutions as above
| | | | | |*1| | 1||Also 100*100dpi
| | | | | | | | ||(Applies colour or grey-scale only)
| | | | | | | | ||(Independent of bits 44,45)
--+--+--+--+--+--+--+--+--++-----------------------------------------
Bit 68 (JPEG) is required for any colour/grey scale mode, and bit 36 indicates additional T.43 capability.
任何颜色/灰度模式都需要位68（JPEG），位36表示额外的T.43功能。
<------- T.30 bits --->
36|68|69|71|74|75| | ||Description
--+--+--+--+--+--+--+--++-----------------------------------------
0| 0| x| | | | | ||No grey scale or colour
x| 1| 0| | | | | ||Grey scale only
0| 1| 1| | | | | ||Full colour capability (CIE L*a*b*)
1|*1| 1| | | | | ||Full and limited colour capability:
| | | | | | | || (CIE L*a*b*, palette, RGB 1 bit/colour
| | | | | | | || and CMY(K)1 bit/colour)
--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | x| | | | ||
| 1| | 0| | | | ||8 bits/pixel and up to 4096 palette entries
| 1| | 1| | | | ||8 or 12 bits/pixel, 65536 palette entries
--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | | x| | | ||
| 1| | | 0| | | ||CIE standard illuminant D50 (per T.42)
| 1| | | 1| | | ||Custom illuminants (definition provided)
--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | | | x| | ||
| 1| | | | 0| | ||Default gamut (per T.42)
| 1| | | | 1| | ||Custom gamuts (definition provided)
--+--+--+--+--+--+--+--++-----------------------------------------
<------- T.30 bits --->
36|68|69|71|74|75| | ||Description
--+--+--+--+--+--+--+--++-----------------------------------------
0| 0| x| | | | | ||No grey scale or colour
x| 1| 0| | | | | ||Grey scale only
0| 1| 1| | | | | ||Full colour capability (CIE L*a*b*)
1|*1| 1| | | | | ||Full and limited colour capability:
| | | | | | | || (CIE L*a*b*, palette, RGB 1 bit/colour
| | | | | | | || and CMY(K)1 bit/colour)
--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | x| | | | ||
| 1| | 0| | | | ||8 bits/pixel and up to 4096 palette entries
| 1| | 1| | | | ||8 or 12 bits/pixel, 65536 palette entries
--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | | x| | | ||
| 1| | | 0| | | ||CIE standard illuminant D50 (per T.42)
| 1| | | 1| | | ||Custom illuminants (definition provided)
--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | | | x| | ||
| 1| | | | 0| | ||Default gamut (per T.42)
| 1| | | | 1| | ||Custom gamuts (definition provided)
--+--+--+--+--+--+--+--++-----------------------------------------
A4 width (215mm) is required as a minimum for Group 3 fax conformance. A Group 3 fax machine must always be able to receive an A4 image.
A4宽度（215mm）是第3组传真一致性的最低要求。第3组传真机必须始终能够接收A4图像。
<---- T.30 bits ------>
17|18|19|20|76|77| | ||Description
--+--+--+--+--+--+--+--++-----------------------------------------
0| 0| | | | | | ||Width = 215mm
1| 0| | | | | | ||Width = 215mm or 255mm
0| 1| | | | | | ||Width = 215mm, 255mm or 303mm
1| 1| | | | | | ||Invalid - interpret as (17=0,18=1)
| | | | | | | ||(measurements described as scan line length)
| | | | | | | ||(corresp. inch measurements: T.4 sect 2.2)
--+--+--+--+--+--+--+--++-----------------------------------------
| | 0| 0| | | | ||Length = 297mm (A4)
| | 1| 0| | | | ||Length = 297mm (A4) or 364mm (B4)
| | 0| 1| | | | ||Length = unlimited
| | 1| 1| | | | ||Invalid
--+--+--+--+--+--+--+--++-----------------------------------------
| | | | 0| 0| | ||Papersize = A4
| | | | 1| 0| | ||Papersize = A4 or NA-Letter
| | | | 0| 1| | ||Papersize = A4 or NA-Legal
| | | | 1| 1| | ||Papersize = A4 or NA-Letter or NA-Legal
| | | | | | | ||(These in addition to paper sizes implied
| | | | | | | || by bits 17-20 above)
--+--+--+--+--+--+--+--++-----------------------------------------
<---- T.30 bits ------>
17|18|19|20|76|77| | ||Description
--+--+--+--+--+--+--+--++-----------------------------------------
0| 0| | | | | | ||Width = 215mm
1| 0| | | | | | ||Width = 215mm or 255mm
0| 1| | | | | | ||Width = 215mm, 255mm or 303mm
1| 1| | | | | | ||Invalid - interpret as (17=0,18=1)
| | | | | | | ||(measurements described as scan line length)
| | | | | | | ||(corresp. inch measurements: T.4 sect 2.2)
--+--+--+--+--+--+--+--++-----------------------------------------
| | 0| 0| | | | ||Length = 297mm (A4)
| | 1| 0| | | | ||Length = 297mm (A4) or 364mm (B4)
| | 0| 1| | | | ||Length = unlimited
| | 1| 1| | | | ||Invalid
--+--+--+--+--+--+--+--++-----------------------------------------
| | | | 0| 0| | ||Papersize = A4
| | | | 1| 0| | ||Papersize = A4 or NA-Letter
| | | | 0| 1| | ||Papersize = A4 or NA-Legal
| | | | 1| 1| | ||Papersize = A4 or NA-Letter or NA-Legal
| | | | | | | ||(These in addition to paper sizes implied
| | | | | | | || by bits 17-20 above)
--+--+--+--+--+--+--+--++-----------------------------------------
This section follows the structure of the previous section, except that the decision tables are restated with feature set expression mappings in the action stub. The feature set expressions use media feature tags presented in "Content feature schema for Internet fax" [4].
本节遵循上一节的结构，但决策表在操作存根中使用功能集表达式映射进行重述。功能集表达式使用“Internet传真的内容功能模式”[4]中显示的媒体功能标记。
To construct a feature set expression corresponding to a collection of DIS frame bits:
要构造与DIS帧位集合相对应的特征集表达式，请执行以下操作：
o Compare the DIS bits with each decision table in the following sections (5.1 to 5.4). Some decision tables consist of a number of sub-tables separated by horizontal lines.
o 将DIS位与以下章节（5.1至5.4）中的每个决策表进行比较。一些决策表由许多由水平线分隔的子表组成。
o The DIS bits will match exactly one row from each table or sub-table: collect the corresponding feature set expression from the action stub (the right hand column of the table).
o DIS位将与每个表或子表中的一行完全匹配：从操作存根（表的右侧列）收集相应的功能集表达式。
o In the case of the table in section 5.2, which consists of several sub-tables, combine the feature set expressions from each sub-table with a logical-OR: (| s1 s2 ... sn ), where 's1', 's2' etc. are the feature set expressions selected from each sub-table. In this way, a single feature set expression is obtained for the table.
o 对于第5.2节中包含多个子表的表，将每个子表中的特征集表达式与逻辑OR组合：（| s1 s2…sn），其中“s1”、“s2”等是从每个子表中选择的特征集表达式。通过这种方式，可获得表格的单个特征集表达式。
o In the case of the tables in sections 5.3 and 5.4, combine the sub-table expressions with a logical-AND: (& s1 s2 ... sn ).
o 对于第5.3节和第5.4节中的表，将子表表达式与逻辑and组合：（&s1 s2…sn）。
o Combine the feature set expressions for each table as follows:
o 按如下方式组合每个表的要素集表达式：
(& (| T511 T512 ) T513 T52 T53 T54 )
（&（| T511 T512）T513 T52 T53 T54）
where:
哪里：
- T511 is the feature set expression obtained from the table in section 5.1.1
- T511是从第5.1.1节表格中获得的特征集表达式
- T512 is obtained from the table in section 5.1.2
- T512从第5.1.2节中的表格中获得
- T513 is obtained from the table in section 5.1.3
- T513从第5.1.3节中的表格中获得
- T52 is obtained from the table in section 5.2
- T52从第5.2节中的表格中获得
- T53 is obtained from the table in section 5.3
- T53从第5.3节中的表格中获得
- T54 is obtained from the table in section 5.4
- T54从第5.4节中的表格中获得
The resulting expression is the feature set expression corresponding to the DIS bits given. Remember that there may be other capabilities not expressed by the DIS bits that should be incorporated into the final feature expression (e.g. TIFF image file structure).
结果表达式是与给定DIS位对应的特征集表达式。请记住，可能存在DIS位未表示的其他功能，这些功能应合并到最终特征表达式中（例如TIFF图像文件结构）。
To do the reverse transformation, match the feature set to each row of each decision table using the matching algorithm in RFC 2533 [2], and OR together the DIS bit masks for each row whose feature set expression is completely contained by (i.e. is a subset of) that given (where the bit value in a table is 'x', use '0').
要进行反向转换，请使用RFC 2533[2]中的匹配算法将特征集匹配到每个决策表的每一行，或将其特征集表达式完全包含在给定的（即是其子集）中的每一行的DIS位掩码一起匹配（其中表中的位值为“x”，使用“0”）。
A feature set A is completely contained by B if the feature set match of A and B (obtained by applying the feature set matching algorithm in [2]) is equal to A.
如果A和B的特征集匹配（通过应用[2]中的特征集匹配算法获得）等于A，则特征集A完全包含在B中。
<------- T.30 bits --------->
15|16|31|36|37|68|69|73|78|79||Feature set expression
--+--+--+--+--+--+--+--+--+--++---------------------------------------
x| 0| 0| | | | | | 0| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH]) )
x| 1| 0| | | | | | 0| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MR])
x| 0| 1| | | | | | 0| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MMR])
x| 1| 1| | | | | | 0| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MR,MMR])
x| 0| 0| | | | | | 1| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size=128) )
x| 1| 0| | | | | | 1| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MR,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size=128) )
x| 0| 1| | | | | | 1| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MMR,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size=128) )
x| 1| 1| | | | | | 1| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MR,MMR,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size=128) )
x| 0| 0| | | | | |*1| 1||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size>=0) )
x| 1| 0| | | | | |*1| 1||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MR,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size>=0) )
x| 0| 1| | | | | |*1| 1||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MMR,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size>=0) )
x| 1| 1| | | | | |*1| 1||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MR,MMR,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size>=0) )
--+--+--+--+--+--+--+--+--+--++---------------------------------------
<------- T.30 bits --------->
15|16|31|36|37|68|69|73|78|79||Feature set expression
--+--+--+--+--+--+--+--+--+--++---------------------------------------
x| 0| 0| | | | | | 0| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH]) )
x| 1| 0| | | | | | 0| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MR])
x| 0| 1| | | | | | 0| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MMR])
x| 1| 1| | | | | | 0| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MR,MMR])
x| 0| 0| | | | | | 1| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size=128) )
x| 1| 0| | | | | | 1| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MR,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size=128) )
x| 0| 1| | | | | | 1| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MMR,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size=128) )
x| 1| 1| | | | | | 1| 0||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MR,MMR,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size=128) )
x| 0| 0| | | | | |*1| 1||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size>=0) )
x| 1| 0| | | | | |*1| 1||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MR,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size>=0) )
x| 0| 1| | | | | |*1| 1||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MMR,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size>=0) )
x| 1| 1| | | | | |*1| 1||(& (color=binary)
| | | | | | | | | || (image-coding=[MH,MR,MMR,JBIG])
| | | | | | | | | || (image-coding-constraint=JBIG-T85)
| | | | | | | | | || (JBIG-stripe-size>=0) )
--+--+--+--+--+--+--+--+--+--++---------------------------------------
<------- T.30 bits --------->
15|16|31|36|37|68|69|73|78|79||Feature set expression
--+--+--+--+--+--+--+--+--+--++---------------------------------------
x| | |*0| x| 0| x| x| | ||
*1| | | 0| x| 1| 0| x| | ||(& (color=grey)
| | | | | | | | | || (image-coding=JPEG)
| | | | | | | | | || (image-coding-constraint=JPEG-T4E) )
*1| | | 0| x| 1| 1| 0| | ||(& (color=[grey,full])
| | | | | | | | | || (image-coding=JPEG)
| | | | | | | | | || (image-coding-constraint=JPEG-T4E)
| | | | | | | | | || (& (color=full)
| | | | | | | | | || (color-subsampling="4:1:1") ) )
*1| | | 0| x| 1| 1| 1| | ||(& (color=[grey,full])
| | | | | | | | | || (image-coding=JPEG)
| | | | | | | | | || (image-coding-constraint=JPEG-T4E)
| | | | | | | | | || (& (color=full)
| | | | | | | | | || (color-subsampling=
| | | | | | | | | || ["1:1:1","4:1:1"]) ) )
*1| | | 1| 0|*1| 0| x| | ||(& (color=grey)
| | | | | | | | | || (image-coding=[JPEG,JBIG])
| | | | | | | | | || (image-coding-constraint=
| | | | | | | | | || [JPEG-T4E,JBIG-T43])
| | | | | | | | | || (image-interleave=stripe) )
*1| | | 1| 1|*1| 0| x| | ||(& (color=grey)
| | | | | | | | | || (image-coding=[JPEG,JBIG])
| | | | | | | | | || (image-coding-constraint=
| | | | | | | | | || [JPEG-T4E,JBIG-T43])
| | | | | | | | | || (image-interleave=[stripe,plane]) )
*1| | | 1| 0|*1| 1| 0| | ||(& (color=[limited,mapped,grey,full])
| | | | | | | | | || (image-coding=[JPEG,JBIG])
| | | | | | | | | || (image-coding-constraint=
| | | | | | | | | || [JPEG-T4E,JBIG-T43])
| | | | | | | | | || (& (color=full)
| | | | | | | | | || (color-subsampling="4:1:1"]) )
| | | | | | | | | || (image-interleave=stripe) )
*1| | | 1| 0|*1| 1| 1| | ||(& (color=[limited,mapped,grey,full])
| | | | | | | | | || (image-coding=[JPEG,JBIG])
| | | | | | | | | || (image-coding-constraint=
| | | | | | | | | || [JPEG-T4E,JBIG-T43])
| | | | | | | | | || (& (color=full)
| | | | | | | | | || (color-subsampling=
| | | | | | | | | || ["1:1:1","4:1:1"]) )
| | | | | | | | | || (image-interleave=stripe) )
<------- T.30 bits --------->
15|16|31|36|37|68|69|73|78|79||Feature set expression
--+--+--+--+--+--+--+--+--+--++---------------------------------------
x| | |*0| x| 0| x| x| | ||
*1| | | 0| x| 1| 0| x| | ||(& (color=grey)
| | | | | | | | | || (image-coding=JPEG)
| | | | | | | | | || (image-coding-constraint=JPEG-T4E) )
*1| | | 0| x| 1| 1| 0| | ||(& (color=[grey,full])
| | | | | | | | | || (image-coding=JPEG)
| | | | | | | | | || (image-coding-constraint=JPEG-T4E)
| | | | | | | | | || (& (color=full)
| | | | | | | | | || (color-subsampling="4:1:1") ) )
*1| | | 0| x| 1| 1| 1| | ||(& (color=[grey,full])
| | | | | | | | | || (image-coding=JPEG)
| | | | | | | | | || (image-coding-constraint=JPEG-T4E)
| | | | | | | | | || (& (color=full)
| | | | | | | | | || (color-subsampling=
| | | | | | | | | || ["1:1:1","4:1:1"]) ) )
*1| | | 1| 0|*1| 0| x| | ||(& (color=grey)
| | | | | | | | | || (image-coding=[JPEG,JBIG])
| | | | | | | | | || (image-coding-constraint=
| | | | | | | | | || [JPEG-T4E,JBIG-T43])
| | | | | | | | | || (image-interleave=stripe) )
*1| | | 1| 1|*1| 0| x| | ||(& (color=grey)
| | | | | | | | | || (image-coding=[JPEG,JBIG])
| | | | | | | | | || (image-coding-constraint=
| | | | | | | | | || [JPEG-T4E,JBIG-T43])
| | | | | | | | | || (image-interleave=[stripe,plane]) )
*1| | | 1| 0|*1| 1| 0| | ||(& (color=[limited,mapped,grey,full])
| | | | | | | | | || (image-coding=[JPEG,JBIG])
| | | | | | | | | || (image-coding-constraint=
| | | | | | | | | || [JPEG-T4E,JBIG-T43])
| | | | | | | | | || (& (color=full)
| | | | | | | | | || (color-subsampling="4:1:1"]) )
| | | | | | | | | || (image-interleave=stripe) )
*1| | | 1| 0|*1| 1| 1| | ||(& (color=[limited,mapped,grey,full])
| | | | | | | | | || (image-coding=[JPEG,JBIG])
| | | | | | | | | || (image-coding-constraint=
| | | | | | | | | || [JPEG-T4E,JBIG-T43])
| | | | | | | | | || (& (color=full)
| | | | | | | | | || (color-subsampling=
| | | | | | | | | || ["1:1:1","4:1:1"]) )
| | | | | | | | | || (image-interleave=stripe) )
*1| | | 1| 1|*1| 1| 0| | ||(& (color=[limited,mapped,grey,full])
| | | | | | | | | || (image-coding=[JPEG,JBIG])
| | | | | | | | | || (image-coding-constraint=
| | | | | | | | | || [JPEG-T4E,JBIG-T43])
| | | | | | | | | || (& (color=full)
| | | | | | | | | || (color-subsampling="4:1:1"]) )
| | | | | | | | | || (image-interleave=[stripe,plane]) )
*1| | | 1| 1|*1| 1| 1| | ||(& (color=[limited,mapped,grey,full])
| | | | | | | | | || (image-coding=[JPEG,JBIG])
| | | | | | | | | || (image-coding-constraint=
| | | | | | | | | || [JPEG-T4E,JBIG-T43])
| | | | | | | | | || (& (color=full)
| | | | | | | | | || (image-coding=JPEG)
| | | | | | | | | || (color-subsampling=
| | | | | | | | | || ["1:1:1","4:1:1"]) )
| | | | | | | | | || (image-interleave=[stripe,plane]) )
--+--+--+--+--+--+--+--+--+--++---------------------------------------
15|16|31|36|37|68|69|73|78|79||
--+--+--+--+--+--+--+--+--+--++---------------------------------------
*1| | | 1| 1|*1| 1| 0| | ||(& (color=[limited,mapped,grey,full])
| | | | | | | | | || (image-coding=[JPEG,JBIG])
| | | | | | | | | || (image-coding-constraint=
| | | | | | | | | || [JPEG-T4E,JBIG-T43])
| | | | | | | | | || (& (color=full)
| | | | | | | | | || (color-subsampling="4:1:1"]) )
| | | | | | | | | || (image-interleave=[stripe,plane]) )
*1| | | 1| 1|*1| 1| 1| | ||(& (color=[limited,mapped,grey,full])
| | | | | | | | | || (image-coding=[JPEG,JBIG])
| | | | | | | | | || (image-coding-constraint=
| | | | | | | | | || [JPEG-T4E,JBIG-T43])
| | | | | | | | | || (& (color=full)
| | | | | | | | | || (image-coding=JPEG)
| | | | | | | | | || (color-subsampling=
| | | | | | | | | || ["1:1:1","4:1:1"]) )
| | | | | | | | | || (image-interleave=[stripe,plane]) )
--+--+--+--+--+--+--+--+--+--++---------------------------------------
15|16|31|36|37|68|69|73|78|79||
--+--+--+--+--+--+--+--+--+--++---------------------------------------
<---- T.30 bits ------>
15|92|93|94|95| | | ||Feature set expression
--+--+--+--+--+--+--+--++---------------------------------------
x| 0| 0| 0| x| | | ||(MRC-mode=0)
*1| #| #| #| 0| | | ||(& (MRC-mode<=###)
| | | | | | | || (MRC-max-stripe-size=[0..256]) )
*1| #| #| #| 1| | | ||(& (MRC-mode<=###)
| | | | | | | || (MRC-max-stripe-size>=0) )
--+--+--+--+--+--+--+--++---------------------------------------
<---- T.30 bits ------>
15|92|93|94|95| | | ||Feature set expression
--+--+--+--+--+--+--+--++---------------------------------------
x| 0| 0| 0| x| | | ||(MRC-mode=0)
*1| #| #| #| 0| | | ||(& (MRC-mode<=###)
| | | | | | | || (MRC-max-stripe-size=[0..256]) )
*1| #| #| #| 1| | | ||(& (MRC-mode<=###)
| | | | | | | || (MRC-max-stripe-size>=0) )
--+--+--+--+--+--+--+--++---------------------------------------
<------- T.30 bits ------>
15|41|42|43|44|45|68|97|98||Feature set expression
--+--+--+--+--+--+--+--+--++-----------------------------------------
0| | | 0| | | | | ||(& (color=binary)
| | | | | | | | || (| (& (dpi=200) (dpi-xyratio=200/100) )
| | | | | | | | || (& (dpi=204)
| | | | | | | | || (dpi-xyratio=204/98) ) ) )
| | | | | | | | ||
1| | | 0| | | | | ||(| (& (color=binary)
| | | | | | | | || (| (& (dpi=204)
| | | | | | | | || (dpi-xyratio=204/98) )
| | | | | | | | || (& (dpi=204)
| | | | | | | | || (dpi-xyratio=204/196) )
| | | | | | | | || (& (dpi=200)
| | | | | | | | || (dpi-xyratio=200/100) ) ) )
| | | | | | | | || (& (dpi=200) (dpi-xyratio=1) ) )
0| | | 1| | | | | ||(| (& (color=binary)
| | | | | | | | || (| (& (dpi=204)
| | | | | | | | || (dpi-xyratio=204/98) )
| | | | | | | | || (& (dpi=408)
| | | | | | | | || (dpi-xyratio=408/391) )
| | | | | | | | || (& (dpi=200)
| | | | | | | | || (dpi-xyratio=200/100) ) ) )
| | | | | | | | || (& (dpi=400) (dpi-xyratio=1) ) )
1| | | 1| | | | | ||(| (& (color=binary)
| | | | | | | | || (| (& (dpi=204)
| | | | | | | | || (dpi-xyratio=204/98) )
| | | | | | | | || (& (dpi=204)
| | | | | | | | || (dpi-xyratio=204/196) )
| | | | | | | | || (& (dpi=408)
| | | | | | | | || (dpi-xyratio=408/391) )
| | | | | | | | || (& (dpi=200)
| | | | | | | | || (dpi-xyratio=200/100) ) ) )
| | | | | | | | || (& (dpi=200) (dpi-xyratio=1) )
| | | | | | | | || (& (dpi=400) (dpi-xyratio=1) ) )
--+--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | | | | | | ||
| 1| | | | | | | ||(& (color=binary)
| | | | | | | | || (dpi=204)
| | | | | | | | || (dpi-xyratio=204/391) )
--+--+--+--+--+--+--+--+--++-----------------------------------------
| | 0| | | | | | ||
| | 1| | | | | | ||(& (dpi=300) (dpi-xyratio=1) )
<------- T.30 bits ------>
15|41|42|43|44|45|68|97|98||Feature set expression
--+--+--+--+--+--+--+--+--++-----------------------------------------
0| | | 0| | | | | ||(& (color=binary)
| | | | | | | | || (| (& (dpi=200) (dpi-xyratio=200/100) )
| | | | | | | | || (& (dpi=204)
| | | | | | | | || (dpi-xyratio=204/98) ) ) )
| | | | | | | | ||
1| | | 0| | | | | ||(| (& (color=binary)
| | | | | | | | || (| (& (dpi=204)
| | | | | | | | || (dpi-xyratio=204/98) )
| | | | | | | | || (& (dpi=204)
| | | | | | | | || (dpi-xyratio=204/196) )
| | | | | | | | || (& (dpi=200)
| | | | | | | | || (dpi-xyratio=200/100) ) ) )
| | | | | | | | || (& (dpi=200) (dpi-xyratio=1) ) )
0| | | 1| | | | | ||(| (& (color=binary)
| | | | | | | | || (| (& (dpi=204)
| | | | | | | | || (dpi-xyratio=204/98) )
| | | | | | | | || (& (dpi=408)
| | | | | | | | || (dpi-xyratio=408/391) )
| | | | | | | | || (& (dpi=200)
| | | | | | | | || (dpi-xyratio=200/100) ) ) )
| | | | | | | | || (& (dpi=400) (dpi-xyratio=1) ) )
1| | | 1| | | | | ||(| (& (color=binary)
| | | | | | | | || (| (& (dpi=204)
| | | | | | | | || (dpi-xyratio=204/98) )
| | | | | | | | || (& (dpi=204)
| | | | | | | | || (dpi-xyratio=204/196) )
| | | | | | | | || (& (dpi=408)
| | | | | | | | || (dpi-xyratio=408/391) )
| | | | | | | | || (& (dpi=200)
| | | | | | | | || (dpi-xyratio=200/100) ) ) )
| | | | | | | | || (& (dpi=200) (dpi-xyratio=1) )
| | | | | | | | || (& (dpi=400) (dpi-xyratio=1) ) )
--+--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | | | | | | ||
| 1| | | | | | | ||(& (color=binary)
| | | | | | | | || (dpi=204)
| | | | | | | | || (dpi-xyratio=204/391) )
--+--+--+--+--+--+--+--+--++-----------------------------------------
| | 0| | | | | | ||
| | 1| | | | | | ||(& (dpi=300) (dpi-xyratio=1) )
--+--+--+--+--+--+--+--+--++-----------------------------------------
| | x| x| | | x| 0| ||
| | x| 1| | |*1| 1| ||(& (dpi=400) (dpi-xyratio=1) )
| |*1| 0| | |*1| 1| ||
--+--+--+--+--+--+--+--+--++-----------------------------------------
| | | | | | x| | 0||
| | | | | |*1| | 1||(| (color=binary)
| | | | | | | | || (& (color=[limited,mapped,grey,full])
| | | | | | | | || (dpi=100) (dpi-xyratio=1) ) )
--+--+--+--+--+--+--+--+--++-----------------------------------------
15|41|42|43|44|45|68|97|98||
--+--+--+--+--+--+--+--+--++-----------------------------------------
--+--+--+--+--+--+--+--+--++-----------------------------------------
| | x| x| | | x| 0| ||
| | x| 1| | |*1| 1| ||(& (dpi=400) (dpi-xyratio=1) )
| |*1| 0| | |*1| 1| ||
--+--+--+--+--+--+--+--+--++-----------------------------------------
| | | | | | x| | 0||
| | | | | |*1| | 1||(| (color=binary)
| | | | | | | | || (& (color=[limited,mapped,grey,full])
| | | | | | | | || (dpi=100) (dpi-xyratio=1) ) )
--+--+--+--+--+--+--+--+--++-----------------------------------------
15|41|42|43|44|45|68|97|98||
--+--+--+--+--+--+--+--+--++-----------------------------------------
Note: all numbers in media feature expressions are integer or rational values; hence the rational number format (n/m) used here.
注：媒体功能表达式中的所有数字均为整数值或有理数；因此这里使用的是有理数格式（n/m）。
Also note: the preferred unit bits (44,45) are not tested here, as a Group 3 fax machine must accept and process either form of units for binary images. All resolutions are expressed in dpi; here are the metric unit equivalents:
另请注意：此处不测试首选单位位（44,45），因为第3组传真机必须接受并处理二进制图像的任一形式的单位。所有决议均以新闻部表示；以下是公制单位的等效值：
204 ~= (1728/215)*25.4 ~= 8.04dpmm expressed in dpi
408 ~= (3456/215)*25.4 ~= 16.08dpmm expressed in dpi
98 ~= 3.85*25.4 ~= 3.85dpmm expressed in dpi
196 ~= 7.70*25.4 ~= 7.70dpmm expressed in dpi
391 ~= 15.40*25.4 ~= 15.40dpmm expressed in dpi
204 ~= (1728/215)*25.4 ~= 8.04dpmm expressed in dpi
408 ~= (3456/215)*25.4 ~= 16.08dpmm expressed in dpi
98 ~= 3.85*25.4 ~= 3.85dpmm expressed in dpi
196 ~= 7.70*25.4 ~= 7.70dpmm expressed in dpi
391 ~= 15.40*25.4 ~= 15.40dpmm expressed in dpi
<------- T.30 bits --->
36|68|69|71|74|75| | ||Feature set expression
--+--+--+--+--+--+--+--++-----------------------------------------
0| 0| x| | | | | ||
x| 1| 0| | | | | ||(| (color=binary)
| | | | | | | || (& (color=grey)
| | | | | | | || (color-space=CIELAB) ) )
0| 1| 1| | | | | ||(| (color=binary)
| | | | | | | || (& (color=[grey,full])
| | | | | | | || (color-space=CIELAB) ) )
1|*1| 1| | | | | ||(| (color=binary)
| | | | | | | || (& (color=limited)
| | | | | | | || (color-space=[Device-RGB,Device-CMY])
| | | | | | | || (color-levels<=8) )
| | | | | | | || (& (color=limited)
| | | | | | | || (color-space=Device-CMYK)
| | | | | | | || (color-levels<=16) )
| | | | | | | || (& (color=[mapped,grey,full])
| | | | | | | || (color-space=CIELAB) ) )
<------- T.30 bits --->
36|68|69|71|74|75| | ||Feature set expression
--+--+--+--+--+--+--+--++-----------------------------------------
0| 0| x| | | | | ||
x| 1| 0| | | | | ||(| (color=binary)
| | | | | | | || (& (color=grey)
| | | | | | | || (color-space=CIELAB) ) )
0| 1| 1| | | | | ||(| (color=binary)
| | | | | | | || (& (color=[grey,full])
| | | | | | | || (color-space=CIELAB) ) )
1|*1| 1| | | | | ||(| (color=binary)
| | | | | | | || (& (color=limited)
| | | | | | | || (color-space=[Device-RGB,Device-CMY])
| | | | | | | || (color-levels<=8) )
| | | | | | | || (& (color=limited)
| | | | | | | || (color-space=Device-CMYK)
| | | | | | | || (color-levels<=16) )
| | | | | | | || (& (color=[mapped,grey,full])
| | | | | | | || (color-space=CIELAB) ) )
--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | x| | | | ||
| 1| | 0| | | | ||(| (color=[binary,limited])
| | | | | | | || (& (color=mapped)
| | | | | | | || (color-levels<=4096) )
| | | | | | | || (& (color=grey)
| | | | | | | || (color-levels<=256) )
| | | | | | | || (& (color=full)
| | | | | | | || (color-levels<=16777216) ) )
| 1| | 1| | | | ||(| (color=[binary,limited])
| | | | | | | || (& (color=mapped)
| | | | | | | || (color-levels<=65536) )
| | | | | | | || (& (color=grey)
| | | | | | | || (color-levels<=4096) )
| | | | | | | || (& (color=full)
| | | | | | | || (color-levels<=68719476736) ) )
--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | | x| | | ||
| 1| | | 0| | | ||(| (color=[binary,limited])
| | | | | | | || (& (color=[mapped,grey,full])
| | | | | | | || (color-illuminant=D50) ) )
| 1| | | 1| | | || -- Any color illuminant: D50 or custom
| | | | | | | || -- See note below
--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | | | x| | ||
| 1| | | | 0| | ||(| (color=[binary,limited])
| | | | | | | || (& (color=grey)
| | | | | | | || (CIELAB-L-min>=0)
| | | | | | | || (CIELAB-L-max<=100) )
| | | | | | | || (& (color=[mapped,full])
| | | | | | | || (CIELAB-L-min>=0)
| | | | | | | || (CIELAB-L-max<=100)
| | | | | | | || (CIELAB-a-min>=-85)
| | | | | | | || (CIELAB-a-max<=85)
| | | | | | | || (CIELAB-b-min>=-75)
| | | | | | | || (CIELAB-b-max<=125) ) )
| 1| | | | 1| | || -- Any color gamut: default or custom
--+--+--+--+--+--+--+--++-----------------------------------------
36|68|69|71|74|75| | ||Feature set expression
--+--+--+--+--+--+--+--++-----------------------------------------
--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | x| | | | ||
| 1| | 0| | | | ||(| (color=[binary,limited])
| | | | | | | || (& (color=mapped)
| | | | | | | || (color-levels<=4096) )
| | | | | | | || (& (color=grey)
| | | | | | | || (color-levels<=256) )
| | | | | | | || (& (color=full)
| | | | | | | || (color-levels<=16777216) ) )
| 1| | 1| | | | ||(| (color=[binary,limited])
| | | | | | | || (& (color=mapped)
| | | | | | | || (color-levels<=65536) )
| | | | | | | || (& (color=grey)
| | | | | | | || (color-levels<=4096) )
| | | | | | | || (& (color=full)
| | | | | | | || (color-levels<=68719476736) ) )
--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | | x| | | ||
| 1| | | 0| | | ||(| (color=[binary,limited])
| | | | | | | || (& (color=[mapped,grey,full])
| | | | | | | || (color-illuminant=D50) ) )
| 1| | | 1| | | || -- Any color illuminant: D50 or custom
| | | | | | | || -- See note below
--+--+--+--+--+--+--+--++-----------------------------------------
| 0| | | | x| | ||
| 1| | | | 0| | ||(| (color=[binary,limited])
| | | | | | | || (& (color=grey)
| | | | | | | || (CIELAB-L-min>=0)
| | | | | | | || (CIELAB-L-max<=100) )
| | | | | | | || (& (color=[mapped,full])
| | | | | | | || (CIELAB-L-min>=0)
| | | | | | | || (CIELAB-L-max<=100)
| | | | | | | || (CIELAB-a-min>=-85)
| | | | | | | || (CIELAB-a-max<=85)
| | | | | | | || (CIELAB-b-min>=-75)
| | | | | | | || (CIELAB-b-max<=125) ) )
| 1| | | | 1| | || -- Any color gamut: default or custom
--+--+--+--+--+--+--+--++-----------------------------------------
36|68|69|71|74|75| | ||Feature set expression
--+--+--+--+--+--+--+--++-----------------------------------------
NOTE: the above table assumes the registration of a feature tag for color illuminant, values of which are tokens that are the same as those described by ITU T.4 [7], Annex E, section E.6.7.
注：上表假设注册了彩色光源的特征标签，其值为与ITU T.4[7]，附录E，第E.6.7节所述相同的标记。
A4 width (215mm) is required as a minimum for Group 3 fax conformance. A Group 3 fax machine must always be able to receive an A4 image.
A4宽度（215mm）是第3组传真一致性的最低要求。第3组传真机必须始终能够接收A4图像。
<---- T.30 bits ------>
17|18|19|20|76|77| | ||Feature set expression
--+--+--+--+--+--+--+--++-----------------------------------------
0| 0| | | | | | ||(Size-x <= 2150/254)
1| 0| | | | | | ||(Size-x <= 2550/254)
x| 1| | | | | | ||(Size-x <= 3030/254)
--+--+--+--+--+--+--+--++-----------------------------------------
| | 0| 0| | | | ||(Size-y <= 2970/254)
| | 1| 0| | | | ||(Size-y <= 3640/254)
| | 0| 1| | | | || -- unlimited
| | 1| 1| | | | || -- invalid
--+--+--+--+--+--+--+--++-----------------------------------------
| | | | 0| 0| | ||(Paper-size=A4)
| | | | 1| 0| | ||(Paper-size=[A4,Letter])
| | | | 0| 1| | ||(Paper-size=[A4,Legal])
| | | | 1| 1| | ||(Paper-size=[A4,Letter,Legal])
--+--+--+--+--+--+--+--++-----------------------------------------
<---- T.30 bits ------>
17|18|19|20|76|77| | ||Feature set expression
--+--+--+--+--+--+--+--++-----------------------------------------
0| 0| | | | | | ||(Size-x <= 2150/254)
1| 0| | | | | | ||(Size-x <= 2550/254)
x| 1| | | | | | ||(Size-x <= 3030/254)
--+--+--+--+--+--+--+--++-----------------------------------------
| | 0| 0| | | | ||(Size-y <= 2970/254)
| | 1| 0| | | | ||(Size-y <= 3640/254)
| | 0| 1| | | | || -- unlimited
| | 1| 1| | | | || -- invalid
--+--+--+--+--+--+--+--++-----------------------------------------
| | | | 0| 0| | ||(Paper-size=A4)
| | | | 1| 0| | ||(Paper-size=[A4,Letter])
| | | | 0| 1| | ||(Paper-size=[A4,Legal])
| | | | 1| 1| | ||(Paper-size=[A4,Letter,Legal])
--+--+--+--+--+--+--+--++-----------------------------------------
NOTE: Although motivated by the requirements of eifax [5], this document is concerned with describing capabilities of Group 3 fax systems [6]. As such, the algorithms do not of themselves create equivalent Internet fax capability statements but, rather, they construct capability expressions that might be incorporated into those for eifax systems.
注：尽管受到eifax[5]要求的推动，但本文件旨在描述第3组传真系统的功能[6]。因此，这些算法本身并不创建等效的Internet传真能力声明，而是构建可并入eifax系统的能力表达式。
This point is illustrated at the end of the first example below where subsection 6.1.1 has been added, which combines T.30 capabilities with an appropriate TIFF file format capability to yield an expression that might be used to describe an Internet fax system.
这一点在下面第一个示例的末尾进行了说明，其中添加了第6.1.1小节，该小节将T.30功能与适当的TIFF文件格式功能结合起来，以生成一个表达式，该表达式可用于描述互联网传真系统。
DIS/DTC
Bit No. DIS/DTC bit description Value
------- ----------------------- -----
15 R8 x 7.7 lines/mm and/or 1
200 x 200 pels/25.4 mm
16 Two dimensional coding capability 1
17,18 Recording width capabilities: 0,0
Scan line length 215 mm + 1%
19,20 Recording length capability: 01
unlimited
31 T.6 (MMR) coding capability 1
36 T.43 (JBIG) coding capability 0
37 Plane interleave 0
41 Resolution: 8x15.4 dpmm 0
42 Resolution: 300x300 dpi 1
43 Resolution: 16x15.4 dpmm and/or 400x400 0
dpi
68 JPEG coding: not supported 0
69 Full color mode: not supported 0
71 12 bits/pel component: not supported 0
73 No subsampling (1:1:1): not supported 0
74 Custom illuminant: not supported 0
75 Custom gamut range: not supported 0
76 North American Letter paper size 1
(8.5"x11") capability
77 North American Legal paper size 0
(8.5"x14") capability: not supported
78 Single-progression sequential coding 0
(T.85, bi-level JBIG) basic capability:
not supported
79 Single-progression sequential coding 0
(T.85, bi-level JBIG) optional L0
capability for other than 128
lines/stripe: not supported
92,93,94 T.44 (Mixed Raster Content) mode: 0,0,0
not supported
95 Page length maximum stripe size for MRC 0
coding: not supported.
97 Multi-level resolution 300x300dpi or 0
400x400dpi: not supported
98 Multi-level resolution 100x100dpi: 0
not supported
DIS/DTC
Bit No. DIS/DTC bit description Value
------- ----------------------- -----
15 R8 x 7.7 lines/mm and/or 1
200 x 200 pels/25.4 mm
16 Two dimensional coding capability 1
17,18 Recording width capabilities: 0,0
Scan line length 215 mm + 1%
19,20 Recording length capability: 01
unlimited
31 T.6 (MMR) coding capability 1
36 T.43 (JBIG) coding capability 0
37 Plane interleave 0
41 Resolution: 8x15.4 dpmm 0
42 Resolution: 300x300 dpi 1
43 Resolution: 16x15.4 dpmm and/or 400x400 0
dpi
68 JPEG coding: not supported 0
69 Full color mode: not supported 0
71 12 bits/pel component: not supported 0
73 No subsampling (1:1:1): not supported 0
74 Custom illuminant: not supported 0
75 Custom gamut range: not supported 0
76 North American Letter paper size 1
(8.5"x11") capability
77 North American Legal paper size 0
(8.5"x14") capability: not supported
78 Single-progression sequential coding 0
(T.85, bi-level JBIG) basic capability:
not supported
79 Single-progression sequential coding 0
(T.85, bi-level JBIG) optional L0
capability for other than 128
lines/stripe: not supported
92,93,94 T.44 (Mixed Raster Content) mode: 0,0,0
not supported
95 Page length maximum stripe size for MRC 0
coding: not supported.
97 Multi-level resolution 300x300dpi or 0
400x400dpi: not supported
98 Multi-level resolution 100x100dpi: 0
not supported
Following the procedure in section 5, matching these DIS bits against the decision tables in sections 5.1 to 5.4, we get:
按照第5节中的程序，将这些DIS位与第5.1至5.4节中的决策表进行匹配，我们得到：
5.1.1 [Bits 16,31,78,79 = 1,1,0,0] (& (color=binary) (image-coding=[MH,MR,MMR]) )
5.1.1 [位16,31,78,79=1,1,0,0]（&（颜色=二进制）（图像编码=[MH，MR，MMR]））
5.1.2 [Bits 15,36,37,68,69,73 = 1,0,0,0,0,0] -- no capabilities
5.1.2 [位15,36,37,68,69,73=1,0,0,0,0]--无能力
5.1.3 [Bits 15,92,93,94,95 = 1,0,0,0,0] (MRC-mode=0)
5.1.3 [位15,92,93,94,95=1,0,0,0]（MRC模式=0）
5.2 [Bits 15,43 = 1,0]
(| (& (color=binary)
(| (& (dpi=204)
(dpi-xyratio=204/98) )
(& (dpi=204)
(dpi-xyratio=204/196) )
(& (dpi=200)
(dpi-xyratio=200/100) ) ) )
(& (dpi=200) (dpi-xyratio=1) ) )
[Bit 41 = 0]
-- no capabilities
[Bit 42 = 1]
(& (dpi=300) (dpi-xyratio=1) )
[Bits 42,43,68,97 = 0,0,0,0]
-- no capabilities
[Bits 68,98 = 0,0]
-- no capabilities
5.2 [Bits 15,43 = 1,0]
(| (& (color=binary)
(| (& (dpi=204)
(dpi-xyratio=204/98) )
(& (dpi=204)
(dpi-xyratio=204/196) )
(& (dpi=200)
(dpi-xyratio=200/100) ) ) )
(& (dpi=200) (dpi-xyratio=1) ) )
[Bit 41 = 0]
-- no capabilities
[Bit 42 = 1]
(& (dpi=300) (dpi-xyratio=1) )
[Bits 42,43,68,97 = 0,0,0,0]
-- no capabilities
[Bits 68,98 = 0,0]
-- no capabilities
5.3 [Bits 36,68,69 = 0,0,0]
-- no capabilities
[Bits 68,71 = 0,0]
-- no capabilities
[Bits 68,74 = 0,0]
-- no capabilities
[Bits 68,75 = 0,0]
-- no capabilities
5.3 [Bits 36,68,69 = 0,0,0]
-- no capabilities
[Bits 68,71 = 0,0]
-- no capabilities
[Bits 68,74 = 0,0]
-- no capabilities
[Bits 68,75 = 0,0]
-- no capabilities
5.4 [Bits 17,18 = 0,0]
(size-x<=2150/254)
[Bits 19,20 = 0,1]
-- no capability constraint
[Bits 76,77 = 1,0]
(Paper-size=[A4,Letter])
5.4 [Bits 17,18 = 0,0]
(size-x<=2150/254)
[Bits 19,20 = 0,1]
-- no capability constraint
[Bits 76,77 = 1,0]
(Paper-size=[A4,Letter])
Combining these as indicated in section 5, we get the following. (The initial expression is constructed verbatim per the rules in the first part of section 5, even though it contains some redundancy.)
如第5节所示，结合这些，我们得到以下结果。（初始表达式是根据第5节第一部分中的规则逐字构造的，尽管它包含一些冗余。）
(& (| (& (color=binary) (image-coding=[MH,MR,MMR]) ) )
(MRC-mode=0)
(| (| (& (color=binary)
(| (& (dpi=204) (dpi-xyratio=204/98) )
(& (dpi=204) (dpi-xyratio=204/196) )
(& (dpi=200) (dpi-xyratio=200/100) ) ) )
(& (dpi=200) (dpi-xyratio=1) ) )
(& (dpi=300) (dpi-xyratio=1) ) )
(& (size-x<=2150/254)
(Paper-size=[A4,Letter]) ) )
(& (| (& (color=binary) (image-coding=[MH,MR,MMR]) ) )
(MRC-mode=0)
(| (| (& (color=binary)
(| (& (dpi=204) (dpi-xyratio=204/98) )
(& (dpi=204) (dpi-xyratio=204/196) )
(& (dpi=200) (dpi-xyratio=200/100) ) ) )
(& (dpi=200) (dpi-xyratio=1) ) )
(& (dpi=300) (dpi-xyratio=1) ) )
(& (size-x<=2150/254)
(Paper-size=[A4,Letter]) ) )
This in turn is simplified as follows. Note that the expression '(& (| (& A B ) ) C ... )' simplifies to just '(& A B C ... )'.
这又被简化如下。请注意，表达式“（&（|）（&ab））C…”简化为“（&ab C…”。
(& (color=binary)
(image-coding=[MH,MR,MMR])
(MRC-mode=0)
(| (& (dpi=204) (dpi-xyratio=204/98) )
(& (dpi=204) (dpi-xyratio=204/196) )
(& (dpi=200) (dpi-xyratio=200/100) )
(& (dpi=200) (dpi-xyratio=1) )
(& (dpi=300) (dpi-xyratio=1) ) )
(size-x<=2150/254)
(Paper-size=[A4,Letter]) )
(& (color=binary)
(image-coding=[MH,MR,MMR])
(MRC-mode=0)
(| (& (dpi=204) (dpi-xyratio=204/98) )
(& (dpi=204) (dpi-xyratio=204/196) )
(& (dpi=200) (dpi-xyratio=200/100) )
(& (dpi=200) (dpi-xyratio=1) )
(& (dpi=300) (dpi-xyratio=1) ) )
(size-x<=2150/254)
(Paper-size=[A4,Letter]) )
In the case of an Internet fax device, additional capabilities not described by the T.30 DIS frame should be included; e.g. the supported TIFF file structure:
对于互联网传真设备，应包括T.30 DIS框架未描述的附加功能；e、 g.支持的TIFF文件结构：
(& (color=binary)
(image-file-structure=[TIFF-Limited,TIFF-Minimal])
(image-coding=[MH,MR,MMR])
(MRC-mode=0)
(| (& (dpi=204) (dpi-xyratio=204/98) )
(& (dpi=204) (dpi-xyratio=205/196) )
(& (dpi=200) (dpi-xyratio=200/100) )
(& (dpi=200) (dpi-xyratio=1) )
(& (dpi=300) (dpi-xyratio=1) ) )
(size-x<=2150/254)
(Paper-size=[A4,Letter]) )
(& (color=binary)
(image-file-structure=[TIFF-Limited,TIFF-Minimal])
(image-coding=[MH,MR,MMR])
(MRC-mode=0)
(| (& (dpi=204) (dpi-xyratio=204/98) )
(& (dpi=204) (dpi-xyratio=205/196) )
(& (dpi=200) (dpi-xyratio=200/100) )
(& (dpi=200) (dpi-xyratio=1) )
(& (dpi=300) (dpi-xyratio=1) ) )
(size-x<=2150/254)
(Paper-size=[A4,Letter]) )
DIS/DTC
Bit No. DIS/DTC bit description Value
------- ----------------------- -----
15 R8 x 7.7 lines/mm and/or 1
200 x 200 pels/25.4 mm
16 Two dimensional coding capability 1
17,18 Recording width capabilities: 0,0
Scan line length 215 mm + 1%
19,20 Recording length capability: 01
unlimited
31 T.6 (MMR) coding capability 1
36 T.43 (JBIG) coding capability 0
37 Plane interleave 0
41 Resolution: 8x15.4 dpmm 1
42 Resolution: 300x300 dpi 0
43 Resolution: 16x15.4 dpmm and/or 400x400 1
dpi
68 JPEG coding: supported 1
69 Full color mode: supported 1
71 12 bits/pel component: not supported 0
73 No subsampling (1:1:1): supported 1
74 Custom illuminant: not supported 0
75 Custom gamut range: not supported 0
76 North American Letter paper size 1
(8.5"x11") capability
77 North American Legal paper size 0
(8.5"x14") capability: not supported
78 Single-progression sequential coding 0
(T.85, bi-level JBIG) basic capability:
not supported
79 Single-progression sequential coding 0
(T.85, bi-level JBIG) optional L0
capability for other than 128
lines/stripe: not supported
92,93,94 T.44 (Mixed Raster Content) mode: 0,0,1
mode 1 supported
95 Page length maximum stripe size for MRC 1
coding.
97 Multi-level resolution 300x300dpi or 1
400x400dpi: supported
98 Multi-level resolution 100x100dpi: 1
supported
DIS/DTC
Bit No. DIS/DTC bit description Value
------- ----------------------- -----
15 R8 x 7.7 lines/mm and/or 1
200 x 200 pels/25.4 mm
16 Two dimensional coding capability 1
17,18 Recording width capabilities: 0,0
Scan line length 215 mm + 1%
19,20 Recording length capability: 01
unlimited
31 T.6 (MMR) coding capability 1
36 T.43 (JBIG) coding capability 0
37 Plane interleave 0
41 Resolution: 8x15.4 dpmm 1
42 Resolution: 300x300 dpi 0
43 Resolution: 16x15.4 dpmm and/or 400x400 1
dpi
68 JPEG coding: supported 1
69 Full color mode: supported 1
71 12 bits/pel component: not supported 0
73 No subsampling (1:1:1): supported 1
74 Custom illuminant: not supported 0
75 Custom gamut range: not supported 0
76 North American Letter paper size 1
(8.5"x11") capability
77 North American Legal paper size 0
(8.5"x14") capability: not supported
78 Single-progression sequential coding 0
(T.85, bi-level JBIG) basic capability:
not supported
79 Single-progression sequential coding 0
(T.85, bi-level JBIG) optional L0
capability for other than 128
lines/stripe: not supported
92,93,94 T.44 (Mixed Raster Content) mode: 0,0,1
mode 1 supported
95 Page length maximum stripe size for MRC 1
coding.
97 Multi-level resolution 300x300dpi or 1
400x400dpi: supported
98 Multi-level resolution 100x100dpi: 1
supported
Matching these DIS bits against the decision tables in sections 5.1 to 5.4, we get:
将这些DIS位与第5.1至5.4节中的决策表相匹配，我们得到：
5.1.1 [Bits 16,31,78,79 = 1,1,0,0] (& (color=binary) (image-coding=[MH,MR,MMR]) )
5.1.1 [位16,31,78,79=1,1,0,0]（&（颜色=二进制）（图像编码=[MH，MR，MMR]））
5.1.2 [Bits 15,36,37,68,69,73 = 1,0,0,1,1,1]
(& (color=[grey,full])
(image-coding=JPEG)
(image-coding-constraint=JPEG-T4E)
(& (color=full)
(image-coding=JPEG)
(color-subsampling=["1:1:1","4:1:1"]) ) )
5.1.2 [Bits 15,36,37,68,69,73 = 1,0,0,1,1,1]
(& (color=[grey,full])
(image-coding=JPEG)
(image-coding-constraint=JPEG-T4E)
(& (color=full)
(image-coding=JPEG)
(color-subsampling=["1:1:1","4:1:1"]) ) )
5.1.3 [Bits 15,92,93,94,95 = 1,0,0,1,1]
(& (MRC-mode<=1) (MRC-max-stripe-size>=0) )
5.1.3 [Bits 15,92,93,94,95 = 1,0,0,1,1]
(& (MRC-mode<=1) (MRC-max-stripe-size>=0) )
5.2 [Bits 15,43 = 1,1]
(| (& (color=binary)
(| (& (dpi=204)
(dpi-xyratio=204/98) )
(& (dpi=204)
(dpi-xyratio=204/196) )
(& (dpi=408)
(dpi-xyratio=408/391) )
(& (dpi=200)
(dpi-xyratio=200/100) ) ) )
(& (dpi=200) (dpi-xyratio=1) )
(& (dpi=400) (dpi-xyratio=1) ) )
[Bit 41 = 1]
(& (color=binary)
(dpi=204) (dpi-xyratio=204/391) )
[Bit 42 = 0]
-- no capabilities
[Bits 42,43,68,97 = 0,1,1,1]
(& (dpi=400) (dpi-xyratio=1) )
[Bits 68,98 = 1,1]
(| (color=binary)
(& (color=[limited,mapped,grey,full])
(dpi=100) (dpi-xyratio=1) ) )
5.2 [Bits 15,43 = 1,1]
(| (& (color=binary)
(| (& (dpi=204)
(dpi-xyratio=204/98) )
(& (dpi=204)
(dpi-xyratio=204/196) )
(& (dpi=408)
(dpi-xyratio=408/391) )
(& (dpi=200)
(dpi-xyratio=200/100) ) ) )
(& (dpi=200) (dpi-xyratio=1) )
(& (dpi=400) (dpi-xyratio=1) ) )
[Bit 41 = 1]
(& (color=binary)
(dpi=204) (dpi-xyratio=204/391) )
[Bit 42 = 0]
-- no capabilities
[Bits 42,43,68,97 = 0,1,1,1]
(& (dpi=400) (dpi-xyratio=1) )
[Bits 68,98 = 1,1]
(| (color=binary)
(& (color=[limited,mapped,grey,full])
(dpi=100) (dpi-xyratio=1) ) )
5.3 [Bits 36,68,69 = 0,1,1] (| (color=binary) (& (color=[grey,full]) (color-space=CIELAB) ) ) [Bits 68,71 = 1,0] (| (color=[binary,limited]) (& (color=mapped)
5.3 [Bits 36,68,69=0,1,1]（|（color=binary）（&（color=[grey，full]）（color space=CIELAB）））[Bits 68,71=1,0]（|（color=[binary，limited]）（&（color=mapped）
(color-levels<=4096) )
(& (color=grey)
(color-levels<=256) )
(& (color=full)
(color-levels<=16777216) ) )
[Bits 68,74 = 1,0]
(| (color=[binary,limited])
(& (color=[mapped,grey,full])
(color-illuminant=D50) ) )
[Bits 68,75 = 1,0]
(| (color=[binary,limited])
(& (color=grey)
(CIELAB-L-min>=0)
(CIELAB-L-max<=100) )
(& (color=[mapped,full])
(CIELAB-L-min>=0)
(CIELAB-L-max<=100)
(CIELAB-a-min>=-85)
(CIELAB-a-max<=85)
(CIELAB-b-min>=-75)
(CIELAB-b-max<=125) ) )
(color-levels<=4096) )
(& (color=grey)
(color-levels<=256) )
(& (color=full)
(color-levels<=16777216) ) )
[Bits 68,74 = 1,0]
(| (color=[binary,limited])
(& (color=[mapped,grey,full])
(color-illuminant=D50) ) )
[Bits 68,75 = 1,0]
(| (color=[binary,limited])
(& (color=grey)
(CIELAB-L-min>=0)
(CIELAB-L-max<=100) )
(& (color=[mapped,full])
(CIELAB-L-min>=0)
(CIELAB-L-max<=100)
(CIELAB-a-min>=-85)
(CIELAB-a-max<=85)
(CIELAB-b-min>=-75)
(CIELAB-b-max<=125) ) )
5.4 [Bits 17,18 = 0,0]
(size-x<=2150/254)
[Bits 19,20 = 0,1]
-- no capability constraint
[Bits 76,77 = 1,0]
(Paper-size=[A4,Letter])
5.4 [Bits 17,18 = 0,0]
(size-x<=2150/254)
[Bits 19,20 = 0,1]
-- no capability constraint
[Bits 76,77 = 1,0]
(Paper-size=[A4,Letter])
Combining these as indicated in section 5, we get the following:
如第5节所示，结合这些因素，我们得到以下结果：
(& (| (& (color=binary)
(image-coding=[MH,MR,MMR]) )
(& (color=[grey,full])
(image-coding=JPEG)
(image-coding-constraint=JPEG-T4E)
(& (color=full)
(image-coding=JPEG)
(color-subsampling=["1:1:1","4:1:1"]) ) )
(& (MRC-mode<=1) (MRC-max-stripe-size>=0) )
(| (| (& (color=binary)
(| (& (dpi=204) (dpi-xyratio=204/98) )
(& (dpi=204) (dpi-xyratio=204/196) )
(& (dpi=408) (dpi-xyratio=408/391) )
(& (dpi=200) (dpi-xyratio=200/100) ) ) )
(& (dpi=200) (dpi-xyratio=1) )
(& (dpi=400) (dpi-xyratio=1) ) )
(& (color=binary)
(& (| (& (color=binary)
(image-coding=[MH,MR,MMR]) )
(& (color=[grey,full])
(image-coding=JPEG)
(image-coding-constraint=JPEG-T4E)
(& (color=full)
(image-coding=JPEG)
(color-subsampling=["1:1:1","4:1:1"]) ) )
(& (MRC-mode<=1) (MRC-max-stripe-size>=0) )
(| (| (& (color=binary)
(| (& (dpi=204) (dpi-xyratio=204/98) )
(& (dpi=204) (dpi-xyratio=204/196) )
(& (dpi=408) (dpi-xyratio=408/391) )
(& (dpi=200) (dpi-xyratio=200/100) ) ) )
(& (dpi=200) (dpi-xyratio=1) )
(& (dpi=400) (dpi-xyratio=1) ) )
(& (color=binary)
(dpi=204) (dpi-xyratio=204/391) )
(& (dpi=400) (dpi-xyratio=1) )
(| (color=binary)
(& (color=[limited,mapped,grey,full])
(dpi=100) (dpi-xyratio=1) ) ) )
(& (| (color=binary)
(& (color=[grey,full]) (color-space=CIELAB) ) )
(| (color=[binary,limited])
(& (color=mapped) (color-levels<=4096) )
(& (color=grey) (color-levels<=256) )
(& (color=full) (color-levels<=16777216) ) )
(| (color=[binary,limited])
(& (color=[mapped,grey,full]) (color-illuminant=D50) ) )
(| (color=[binary,limited])
(& (color=grey)
(CIELAB-L-min>=0)
(CIELAB-L-max<=100) )
(& (color=[mapped,full])
(CIELAB-L-min>=0)
(CIELAB-L-max<=100)
(CIELAB-a-min>=-85)
(CIELAB-a-max<=85)
(CIELAB-b-min>=-75)
(CIELAB-b-max<=125) ) ) )
(& (size-x<=2150/254)
(Paper-size=[A4,Letter]) ) )
(dpi=204) (dpi-xyratio=204/391) )
(& (dpi=400) (dpi-xyratio=1) )
(| (color=binary)
(& (color=[limited,mapped,grey,full])
(dpi=100) (dpi-xyratio=1) ) ) )
(& (| (color=binary)
(& (color=[grey,full]) (color-space=CIELAB) ) )
(| (color=[binary,limited])
(& (color=mapped) (color-levels<=4096) )
(& (color=grey) (color-levels<=256) )
(& (color=full) (color-levels<=16777216) ) )
(| (color=[binary,limited])
(& (color=[mapped,grey,full]) (color-illuminant=D50) ) )
(| (color=[binary,limited])
(& (color=grey)
(CIELAB-L-min>=0)
(CIELAB-L-max<=100) )
(& (color=[mapped,full])
(CIELAB-L-min>=0)
(CIELAB-L-max<=100)
(CIELAB-a-min>=-85)
(CIELAB-a-max<=85)
(CIELAB-b-min>=-75)
(CIELAB-b-max<=125) ) ) )
(& (size-x<=2150/254)
(Paper-size=[A4,Letter]) ) )
This in turn simplifies to:
这反过来又简化为：
(| (& (color=binary)
(image-coding=[MH,MR,MMR])
(MRC-mode<=1) (MRC-max-stripe-size>=0)
(| (& (dpi=204) (dpi-xyratio=204/98) )
(& (dpi=204) (dpi-xyratio=204/196) )
(& (dpi=204) (dpi-xyratio=204/391) )
(& (dpi=408) (dpi-xyratio=408/391) )
(& (dpi=200) (dpi-xyratio=200/100) )
(& (dpi=200) (dpi-xyratio=1) )
(& (dpi=400) (dpi-xyratio=1) ) )
(size-x<=2150/254)
(Paper-size=[A4,Letter]) )
(& (color=grey)
(image-coding=JPEG)
(image-coding-constraint=JPEG-T4E)
(MRC-mode<=1) (MRC-max-stripe-size>=0)
(dpi=[100,200,400]) (dpi-xyratio=1)
(color-space=CIELAB)
(color-levels<=256)
(| (& (color=binary)
(image-coding=[MH,MR,MMR])
(MRC-mode<=1) (MRC-max-stripe-size>=0)
(| (& (dpi=204) (dpi-xyratio=204/98) )
(& (dpi=204) (dpi-xyratio=204/196) )
(& (dpi=204) (dpi-xyratio=204/391) )
(& (dpi=408) (dpi-xyratio=408/391) )
(& (dpi=200) (dpi-xyratio=200/100) )
(& (dpi=200) (dpi-xyratio=1) )
(& (dpi=400) (dpi-xyratio=1) ) )
(size-x<=2150/254)
(Paper-size=[A4,Letter]) )
(& (color=grey)
(image-coding=JPEG)
(image-coding-constraint=JPEG-T4E)
(MRC-mode<=1) (MRC-max-stripe-size>=0)
(dpi=[100,200,400]) (dpi-xyratio=1)
(color-space=CIELAB)
(color-levels<=256)
(color-illuminant=D50)
(CIELAB-L-min>=0)
(CIELAB-L-max<=100)
(size-x<=2150/254)
(Paper-size=[A4,Letter]) )
(& (color=full)
(image-coding=JPEG)
(image-coding-constraint=JPEG-T4E)
(color-subsampling=["1:1:1","4:1:1"])
(MRC-mode<=1) (MRC-max-stripe-size>=0)
(dpi=[100,200,400]) (dpi-xyratio=1)
(color-space=CIELAB)
(color-levels<=16777216)
(color-illuminant=D50)
(CIELAB-L-min>=0)
(CIELAB-L-max<=100)
(CIELAB-a-min>=-85)
(CIELAB-a-max<=85)
(CIELAB-b-min>=-75)
(CIELAB-b-max<=125)
(size-x<=2150/254)
(Paper-size=[A4,Letter]) ) )
(color-illuminant=D50)
(CIELAB-L-min>=0)
(CIELAB-L-max<=100)
(size-x<=2150/254)
(Paper-size=[A4,Letter]) )
(& (color=full)
(image-coding=JPEG)
(image-coding-constraint=JPEG-T4E)
(color-subsampling=["1:1:1","4:1:1"])
(MRC-mode<=1) (MRC-max-stripe-size>=0)
(dpi=[100,200,400]) (dpi-xyratio=1)
(color-space=CIELAB)
(color-levels<=16777216)
(color-illuminant=D50)
(CIELAB-L-min>=0)
(CIELAB-L-max<=100)
(CIELAB-a-min>=-85)
(CIELAB-a-max<=85)
(CIELAB-b-min>=-75)
(CIELAB-b-max<=125)
(size-x<=2150/254)
(Paper-size=[A4,Letter]) ) )
Security considerations are discussed in the fax feature schema description [4]. This memo is not believed to introduce any additional security concerns.
传真功能模式说明[4]中讨论了安全注意事项。据信，这份备忘录不会带来任何额外的安全问题。
The authors gratefully acknowledge the following persons who made comments on earlier versions of this memo: Mr. Hiroshi Tamura and and Dr. Robert Buckley.
作者衷心感谢对本备忘录早期版本发表评论的以下人士：田村弘先生和罗伯特·巴克利博士。
[1] Holtman, K., Mutz, A. and T. Hardie, "Media Feature Tag Registration Procedure", RFC 2506, March 1999.
[1] Holtman，K.，Mutz，A.和T.Hardie，“媒体功能标签注册程序”，RFC 2506，1999年3月。
[2] Graham, K., "A syntax for describing media feature sets" RFC 2533, March 1999.
[2] 格雷厄姆，K.，“描述媒体功能集的语法”，RFC2533，1999年3月。
[3] Masinter, L., Holtman, K., Mutz, A. and D. Wing, "Media Features for Display, Print, and Fax", RFC 2534, March 1999.
[3] Masinter，L.，Holtman，K.，Mutz，A.和D.Wing，“用于显示、打印和传真的媒体功能”，RFC 25341999年3月。
[4] Klyne, G. and L. McIntyre, "Content Feature Schema for Internet Fax (V2)", RFC 2879, July 2000.
[4] Klyne，G.和L.McIntyre，“因特网传真的内容特征模式（V2）”，RFC 28792000年7月。
[5] Masinter, L. and D. Wing, "Extended Facsimile Using Internet Mail", RFC 2532, March 1999.
[5] Masinter，L.和D.Wing，“使用互联网邮件的扩展传真”，RFC 25321999年3月。
[6] "Procedures for document facsimile transmission in the general switched telephone network" ITU-T Recommendation T.30 (1996), including Amendment 1 (1997), Amendment 2 (1997), Amendment 3 (1998) and Amendment 4 (1999) International Telecommunications Union
[6] “通用交换电话网中文件传真传输的程序”，ITU-T建议T.30（1996），包括国际电信联盟第1条修正案（1997）、第2条修正案（1997）、第3条修正案（1998）和第4条修正案（1999）
[7] "Standardization of Group 3 facsimile terminals for document transmission" ITU-T Recommendation T.4 (1996), including Amendment 1 (1997), Amendment 2 (1997) and Amendment 3 (1999) International Telecommunications Union (Covers basic fax coding formats: MH, MR; Annex E deals with some color image related matters, including codes for optional custom illuminants. Annex G deals with some aspects of JBIG encoding of multi-level images.)
[7] “用于文件传输的第3组传真终端的标准化”ITU-T建议T.4（1996），包括国际电信联盟第1次修正案（1997年）、第2次修正案（1997年）和第3次修正案（1999年）（涵盖基本传真编码格式：MH、MR；附录E涉及一些彩色图像相关事宜，包括可选定制光源的代码。附录G涉及多级图像JBIG编码的一些方面。）
[8] "Facsimile coding schemes and coding control functions for Group 4 facsimile apparatus" ITU Recommendation T.6 International Telecommunications Union (Commonly referred to as the MMR standard; covers extended 2-D fax coding format)
[8] “第4组传真设备的传真编码方案和编码控制功能”ITU建议T.6国际电信联盟（通常称为MMR标准；涵盖扩展的二维传真编码格式）
[9] "Continuous-tone colour representation method for facsimile" ITU-T Recommendation T.42 (1996) International Telecommunications Union (Covers custom illuminant, gamut)
[9] “传真用连续色调颜色表示法”ITU-T建议T.42（1996）国际电信联盟（包括定制光源、色域）
[10] "Colour and gray-scale image representation using lossless coding scheme for facsimile" ITU-T Recommendation T.43 (1997) International Telecommunications Union (Covers JBIG for colour/grey images)
[10] “使用传真无损编码方案的彩色和灰度图像表示法”ITU-T建议T.43（1997）国际电信联盟（包括JBIG彩色/灰度图像）
[11] "Mixed Raster Content (MRC)" ITU-T Recommendation T.44 (1999) International Telecommunications Union
[11] “混合光栅内容（MRC）”ITU-T建议T.44（1999）国际电信联盟
[12] "Information technology - Digital compression and coding of continuous-tone still image - Requirements and guidelines" ITU-T Recommendation T.81 (1992) | ISO/IEC 10918-1:1993 International Telecommunications Union (Commonly referred to as JPEG standard)
[12] “信息技术.连续色调静止图像的数字压缩和编码.要求和指南”ITU-T建议T.81（1992）| ISO/IEC 10918-1:1993国际电信联盟（通常称为JPEG标准）
[13] "Information technology - Coded representation of picture and audio information - Progressive bi-level image compression" ITU-T Recommendation T.82 (1993) | ISO/IEC 11544:1993 International Telecommunications Union (Commonly referred to as JBIG1 standard)
[13] “信息技术.图像和音频信息的编码表示.渐进式双电平图像压缩”ITU-T建议T.82（1993）| ISO/IEC 11544:1993国际电信联盟（通常称为JBIG1标准）
[14] "Application profile for Recommendation T.82 - Progressive bi-level image compression (JBIG1 coding scheme for facsimile apparatus)" ITU-T Recommendation T.85 (1995), including Amendment 1 (1996), Amendment 2 (1997) and Corrigendum 1 (1997) International Telecommunications Union (Covers bi-level JBIG)
[14] “建议T.82的应用概况-渐进式双电平图像压缩（传真设备的JBIG1编码方案）”ITU-T建议T.85（1995），包括修正案1（1996）、修正案2（1997）和勘误表1（1997）国际电信联盟（涵盖双电平JBIG）
[15] Klyne, G., "Protocol-independent Content Negotiation Framework", RFC 2703, September 1999.
[15] Klyne，G.，“独立于协议的内容协商框架”，RFC 2703，1999年9月。
[16] "Programs from Decision Tables" E. Humbey Macdonald/American Elsevier computer monographs (19), 1973 ISBN 0-444-19569-6/0- 356-04126-3 (This is an old title, and may not be still in print. It contains a number of references to decision table articles published in Communications of the ACM: August 1967, September 1970, January 1966, November 1966, October 1968, January 1965, February 1964, June 1970, November 1965, June 1965, February 1971.)
[16] “决策表中的程序”E.Humbey Macdonald/美国爱思唯尔计算机专著（19），1973年ISBN 0-444-19569-6/0-356-04126-3（这是一个旧标题，可能尚未出版。它包含对ACM通讯中发布的决策表文章的大量引用：1967年8月、1970年9月、1966年1月、1966年11月、1968年10月、1965年1月、1964年2月、1970年6月、1965年11月、1965年6月、1971年2月。）
[17] "Mixed Raster Content (MRC) mode for G3 facsimile" ITU-T Recommendation T.4, Annex H (1999) International Telecommunications Union (Covers stripe size)
[17] “G3传真的混合光栅内容（MRC）模式”ITU-T建议T.4，附件H（1999）国际电信联盟（涵盖条纹尺寸）
Lloyd McIntyre Xerox Corporation Mailstop PAHV-121 3400 Hillview Ave. Palo Alto, CA 94304 USA
劳埃德·麦金太尔施乐公司邮箱PAHV-121美国加利福尼亚州帕洛阿尔托市希尔维尤大道3400号，邮编94304
Phone: +1-650-813-6762
Fax: +1-650-845-2340
EMail: Lloyd.McIntyre@pahv.xerox.com
Phone: +1-650-813-6762
Fax: +1-650-845-2340
EMail: Lloyd.McIntyre@pahv.xerox.com
Graham Klyne Content Technologies Ltd. 1220 Parkview, Arlington Business Park Theale Reading, RG7 4SA United Kingdom
格雷厄姆·克莱恩内容技术有限公司，地址：英国RG7 4SA阿灵顿商业园Theale Reading Parkview 1220
Phone: +44 118 930 1300
Fax: +44 118 930 1301
EMail: GK@ACM.ORG
Phone: +44 118 930 1300
Fax: +44 118 930 1301
EMail: GK@ACM.ORG
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Acknowledgement
确认
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