Network Working Group L. McIntyre
Request for Comments: 3950 Consultant
Obsoletes: 3250 G. Parsons
Category: Standards Track Nortel Networks
J. Rafferty
Brooktrout Technology
February 2005
Network Working Group L. McIntyre
Request for Comments: 3950 Consultant
Obsoletes: 3250 G. Parsons
Category: Standards Track Nortel Networks
J. Rafferty
Brooktrout Technology
February 2005
Tag Image File Format Fax eXtended (TIFF-FX) - image/tiff-fx MIME Sub-type Registration
标签图像文件格式传真扩展（TIFF-FX）-图像/TIFF-FX MIME子类型注册
Status of this Memo
本备忘录的状况
This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.
本文件规定了互联网社区的互联网标准跟踪协议，并要求进行讨论和提出改进建议。有关本协议的标准化状态和状态，请参考当前版本的“互联网官方协议标准”（STD 1）。本备忘录的分发不受限制。
Copyright Notice
版权公告
Copyright (C) The Internet Society (2005).
版权所有（C）互联网协会（2005年）。
Abstract
摘要
This document describes the registration of the MIME sub-type image/tiff-fx. The encodings are defined by File Format for Internet Fax and its extensions.
本文档介绍MIME子类型image/tiff fx的注册。编码由Internet传真及其扩展名的文件格式定义。
This document describes the registration of the MIME sub-type image/tiff-fx. The encodings are defined by File Format for Internet Fax [TIFF-FX] and its extensions.
本文档介绍MIME子类型image/tiff fx的注册。编码由Internet传真[TIFF-FX]及其扩展名的文件格式定义。
This document is a product of the IETF Internet Fax Working Group.
本文件是IETF互联网传真工作组的产品。
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14, RFC 2119 [REQ].
本文件中的关键词“必须”、“不得”、“要求”、“应”、“不应”、“应”、“不应”、“建议”、“可”和“可选”应按照BCP 14、RFC 2119[REQ]中的说明进行解释。
Tag Image File Format Fax eXtended (TIFF-FX), is defined in detail by RFC 3949, "File Format for Internet Fax" [TIFF-FX].
标签图像文件格式传真扩展（TIFF-FX）由RFC 3949“互联网传真文件格式”[TIFF-FX]详细定义。
While a brief scope and feature description is provided in this section as background information, the reader is directed to the original TIFF-FX specification (File Format for Internet Fax) to obtain complete feature and technical details.
虽然本节提供了简要的范围和功能描述作为背景信息，但读者应参考原始TIFF-FX规范（互联网传真文件格式），以获得完整的功能和技术细节。
This document defines a TIFF-based file format specification for enabling standardized messaging-based fax over the Internet. It specifies the TIFF fields and field values required for compatibility with the existing ITU-T Recommendations for Group 3 black-and-white, grayscale and color facsimile. TIFF has historically been used for handling fax image files in applications such as store-and-forward messaging. Implementations that support this file format specification for import/export may elect to support it as a native format. This document recommends a TIFF file structure that is compatible with low-memory and page-level streaming implementations.
本文档定义了一个基于TIFF的文件格式规范，用于在Internet上启用标准化的基于消息传递的传真。它规定了与第3组黑白、灰度和彩色传真现有ITU-T建议兼容所需的TIFF字段和字段值。TIFF历来用于处理应用程序（如存储和转发消息）中的传真图像文件。支持此文件格式规范进行导入/导出的实现可以选择将其作为本机格式支持。本文档推荐与低内存和页面级流媒体实现兼容的TIFF文件结构。
Unless otherwise noted, the current TIFF specification [TIFF] and selected TIFF Technical Notes [TTN1, TTN2] are the primary references for describing TIFF and defining TIFF fields. This document is the primary reference for defining TIFF field values for fax applications.
除非另有说明，当前的TIFF规范[TIFF]和选定的TIFF技术说明[TTN1，TTN2]是描述TIFF和定义TIFF字段的主要参考。本文档是定义传真应用程序TIFF字段值的主要参考。
Some of the features of TIFF-FX are:
TIFF-FX的一些功能包括：
- TIFF-FX is capable of describing bilevel, grayscale, palette-color, full-color and mixed content image data.
- TIFF-FX能够描述双层、灰度、调色板颜色、全色和混合内容图像数据。
- TIFF-FX includes a number of compression schemes that allow developers to choose the best space or time tradeoff for their applications.
- TIFF-FX包括许多压缩方案，允许开发人员为其应用程序选择最佳的空间或时间权衡。
- TIFF-FX is designed to be extensible and to evolve gracefully as new needs arise.
- TIFF-FX设计为可扩展，并随着新需求的出现而优雅地发展。
This document defines the image/tiff-fx MIME sub-type to refer to TIFF-FX Profiles J, C, L and M encoded image data and any future TIFF-FX extensions, or a subset. The image/tiff-fx content type MAY be used when black-and-white image data is encoded using TIFF-FX Profiles S or F, or a subset, however, the image/tiff content type SHOULD be used.
本文档定义了图像/tiff-fx MIME子类型，以引用tiff-fx配置文件J、C、L和M编码的图像数据以及任何未来的tiff-fx扩展或子集。当使用tiff-fx配置文件S或F或子集对黑白图像数据进行编码时，可以使用图像/tiff fx内容类型，但应使用图像/tiff内容类型。
To: ietf-types@iana.org
Subject: Registration of Standard MIME media type image/tiff-fx
To: ietf-types@iana.org
Subject: Registration of Standard MIME media type image/tiff-fx
MIME media type name: image
MIME媒体类型名称：映像
MIME subtype name: tiff-fx
MIME子类型名称：tiff fx
Required parameters: none
所需参数：无
Optional parameters: none
可选参数：无
Encoding Considerations:
编码注意事项：
This media type consists of binary data. The base64 encoding should be used on transports that cannot accommodate binary data directly.
此媒体类型由二进制数据组成。base64编码应用于不能直接容纳二进制数据的传输。
Security considerations:
安全考虑：
TIFF-FX utilizes a structure which can store image data and attributes of this image data. The fields defined in the TIFF-FX specification are of a descriptive nature and provide information that is useful to facilitate viewing and rendering of images by a recipient. As such, the fields currently defined in the TIFF-FX specification do not in themselves create additional security risks, since the fields are not used to induce any particular behavior by the recipient application.
TIFF-FX利用一种可以存储图像数据和该图像数据属性的结构。TIFF-FX规范中定义的字段具有描述性，并提供有助于收件人查看和呈现图像的信息。因此，TIFF-FX规范中当前定义的字段本身不会产生额外的安全风险，因为这些字段不用于诱导接收方应用程序的任何特定行为。
TIFF-FX has an extensible structure, so that it is theoretically possible that fields could be defined in the future which could be used to induce particular actions on the part of the recipient, thus presenting additional security risks, but this type of capability is not supported in the referenced TIFF-FX specification. Indeed, the definition of fields which would include such processing instructions is inconsistent with the goals and spirit of the TIFF-FX specification.
TIFF-FX具有可扩展的结构，因此理论上可以在将来定义字段，这些字段可用于引导接收方采取特定行动，从而带来额外的安全风险，但参考TIFF-FX规范中不支持此类功能。事实上，包含此类处理指令的字段定义与TIFF-FX规范的目标和精神不一致。
The MIME type and file extension defined by this document MUST NOT be used to blindly select a processing program. It is up to the implementation to determine the application (if necessary) and render the image to the user.
不得使用本文档定义的MIME类型和文件扩展名盲目选择处理程序。由实现决定应用程序（如果需要）并向用户呈现图像。
Interoperability considerations:
互操作性注意事项：
The ability of implementations to handle all the defined applications (or profiles within applications) of TIFF-FX may not be ubiquitous. As a result, implementations may decode and attempt to display the encoded TIFF-FX image data only to determine that the image cannot be rendered.
实现处理TIFF-FX的所有已定义应用程序（或应用程序中的配置文件）的能力可能并不普遍。因此，实现可能会解码并尝试仅显示编码的TIFF-FX图像数据，以确定图像无法渲染。
Published specification:
已发布的规范：
TIFF-FX (Tag Image File Format Fax eXtended) is defined in:
TIFF-FX（标签图像文件格式传真扩展）定义如下：
RFC 3949, "File Format for Internet Fax", February 2005, Buckley, R., Venable, D., McIntyre, L., Parsons, G., and J. Rafferty.
RFC 3949，“互联网传真文件格式”，2005年2月，巴克利，R.，维纳布尔，D.，麦金太尔，L.，帕森斯，G.，和J.拉弗蒂。
Applications which use this media type:
使用此媒体类型的应用程序：
Imaging, fax, messaging and multi-media
图像、传真、信息和多媒体
Additional information:
其他信息：
Magic number(s):
II (little-endian): 49 49 2A 00 hex
MM (big-endian): 4D 4D 00 2A hex
File extension(s): .TFX
Macintosh File Type Code(s): TFX
Magic number(s):
II (little-endian): 49 49 2A 00 hex
MM (big-endian): 4D 4D 00 2A hex
File extension(s): .TFX
Macintosh File Type Code(s): TFX
Person & email address to contact for further information:
联系人和电子邮件地址，以获取更多信息：
Lloyd McIntyre Lloyd_McIntyre@Dell.com
劳埃德麦金太尔劳埃德_McIntyre@Dell.com
Glenn W. Parsons gparsons@nortelnetworks.com
格伦·W·帕森斯gparsons@nortelnetworks.com
James Rafferty jraff@brooktrout.com
詹姆斯·拉弗蒂jraff@brooktrout.com
Intended usage: COMMON
预期用途：普通
Change controller: Lloyd McIntyre
变更控制员：劳埃德麦金太尔
TIFF-FX utilizes a structure which can store image data and attributes of this image data. The fields defined in the TIFF-FX specification are of a descriptive nature and provide information that is useful to facilitate viewing and rendering of images by a recipient. As such, the fields currently defined in the TIFF-FX specification do not in themselves create additional security risks, since the fields are not used to induce any particular behavior by the recipient application.
TIFF-FX利用一种可以存储图像数据和该图像数据属性的结构。TIFF-FX规范中定义的字段具有描述性，并提供有助于收件人查看和呈现图像的信息。因此，TIFF-FX规范中当前定义的字段本身不会产生额外的安全风险，因为这些字段不用于诱导接收方应用程序的任何特定行为。
TIFF-FX has an extensible structure, so that it is theoretically possible that fields could be defined in the future which could be used to induce particular actions on the part of the recipient, thus presenting additional security risks, but this type of capability is not supported in the referenced TIFF-FX specification. Indeed, the definition of fields which would include such processing instructions is inconsistent with the goals and spirit of the TIFF-FX specification.
TIFF-FX具有可扩展的结构，因此理论上可以在将来定义字段，这些字段可用于引导接收方采取特定行动，从而带来额外的安全风险，但参考TIFF-FX规范中不支持此类功能。事实上，包含此类处理指令的字段定义与TIFF-FX规范的目标和精神不一致。
The MIME type and file extension defined by this document MUST NOT be used to blindly select a processing program. It is up to the implementation to determine the application (if necessary) and render the image to the user.
不得使用本文档定义的MIME类型和文件扩展名盲目选择处理程序。由实现决定应用程序（如果需要）并向用户呈现图像。
[TIFF-FX] Buckley, R., Venable, D., McIntyre, L., Parsons, G., and J. Rafferty, "File Format for Internet Fax", RFC 3949, February 2005.
[TIFF-FX]Buckley，R.，Venable，D.，McIntyre，L.，Parsons，G.，和J.Rafferty，“互联网传真的文件格式”，RFC 39492005年2月。
[TIFF] Adobe Developers Association, TIFF (TM) Revision 6.0 - Final, June 3, 1992.
[TIFF]Adobe开发者协会，TIFF（TM）6.0版-最终版，1992年6月3日。
[REQ] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
[REQ]Bradner，S.，“在RFC中用于指示需求水平的关键词”，BCP 14，RFC 2119，1997年3月。
[TTN1] Adobe PageMaker 6.0 TIFF Technical Notes, Sept. 14, 1995,
http://partners.adobe.com/asn/developer/pdfs/tn/TIFFPM6.pdf
[TTN1] Adobe PageMaker 6.0 TIFF Technical Notes, Sept. 14, 1995,
http://partners.adobe.com/asn/developer/pdfs/tn/TIFFPM6.pdf
[TTN2] Adobe Photoshop TIFF Technical Notes, Replacement TIFF/JPEG
specification, March 22, 2002,
http://partners.adobe.com/asn/developer/pdfs/tn/
TIFFphotoshop.pdf
[TTN2] Adobe Photoshop TIFF Technical Notes, Replacement TIFF/JPEG
specification, March 22, 2002,
http://partners.adobe.com/asn/developer/pdfs/tn/
TIFFphotoshop.pdf
Annex A. List of edits to RFC 3250
附件A.RFC 3250的编辑列表
+----+---------+-------------------------------------------------+
| No.| Section | Edit |
+----+---------+-------------------------------------------------+
| 1. | All | Updated references from RFC 2301 to |
| | | draft-ietf-fax-tiff-fx-13.txt |
+----+---------+-------------------------------------------------+
| 2. | 5 | MIME Definition - added a "SHOULD" statement to |
| | | stress that image/tiff is the preferred content |
| | | type when representing Profiles S and/or F. |
+----+---------+-------------------------------------------------+
| 3. | 7 | Revise security considerations. |
+----+---------+-------------------------------------------------+
| 4. | 3 | Merged sections 2 & 3 and renumbered. |
+----+---------+-------------------------------------------------+
+----+---------+-------------------------------------------------+
| No.| Section | Edit |
+----+---------+-------------------------------------------------+
| 1. | All | Updated references from RFC 2301 to |
| | | draft-ietf-fax-tiff-fx-13.txt |
+----+---------+-------------------------------------------------+
| 2. | 5 | MIME Definition - added a "SHOULD" statement to |
| | | stress that image/tiff is the preferred content |
| | | type when representing Profiles S and/or F. |
+----+---------+-------------------------------------------------+
| 3. | 7 | Revise security considerations. |
+----+---------+-------------------------------------------------+
| 4. | 3 | Merged sections 2 & 3 and renumbered. |
+----+---------+-------------------------------------------------+
Authors' Addresses
作者地址
Lloyd McIntyre 10328 S. Stelling Road Cupertino, CA 95014 USA
劳埃德·麦金太尔10328 S.斯泰林路库比蒂诺，加利福尼亚州95014
Phone: +1-408-725-1624
EMail: lloyd10328@pacbell.net or
Lloyd_McIntyre@Dell.com
Phone: +1-408-725-1624
EMail: lloyd10328@pacbell.net or
Lloyd_McIntyre@Dell.com
Glenn W. Parsons Nortel Networks P.O. Box 3511, Station C Ottawa, ON K1Y 4H7 Canada
加拿大K1Y 4H7渥太华C站Glenn W.Parsons Nortel Networks邮政信箱3511
Phone: +1-613-763-7582
Fax: +1-613-967-5060
EMail: gparsons@nortel.com
Phone: +1-613-763-7582
Fax: +1-613-967-5060
EMail: gparsons@nortel.com
James Rafferty Brooktrout Technology 410 First Avenue Needham, MA 02494 USA
James Rafferty Brooktrout Technology 410第一大道李约瑟，马萨诸塞州02494
Phone: +1-781-433-9462
Fax: +1-781-433-9268
EMail: jraff@brooktrout.com
Phone: +1-781-433-9462
Fax: +1-781-433-9268
EMail: jraff@brooktrout.com
Full Copyright Statement
完整版权声明
Copyright (C) The Internet Society (2005).
版权所有（C）互联网协会（2005年）。
This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights.
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知识产权
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IETF邀请任何相关方提请其注意任何版权、专利或专利申请，或其他可能涵盖实施本标准所需技术的专有权利。请将信息发送至IETF的IETF-ipr@ietf.org.
Acknowledgement
确认
Funding for the RFC Editor function is currently provided by the Internet Society.
RFC编辑功能的资金目前由互联网协会提供。