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Network Working Group                                        L. McIntyre
Request for Comments: 3250                             Xerox Corporation
Category: Standards Track                                     G. Parsons
                                                         Nortel Networks
                                                             J. Rafferty
                                                   Brooktrout Technology
                                                          September 2002


     Tag Image File Format Fax eXtended (TIFF-FX) - image/tiff-fx
                      MIME Sub-type Registration

Status of this Memo

   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.

Copyright Notice

   Copyright (C) The Internet Society (2002).  All Rights Reserved.

Abstract

   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.

1. Conventions used in this document

   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 RFC-2119 [REQ].

2. Overview

   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.

3. Internet Fax Working Group

   This document is a product of the IETF Internet Fax Working Group.
   All comments on this document should be forwarded to the email
   distribution list at <ietf-fax@imc.org>.




McIntyre, et. al.           Standards Track                     [Page 1]

RFC 3250                     image/tiff-fx                September 2002


3. TIFF-FX Definition

   TIFF-FX (Tag Image File Format Fax eXtended), is defined in detail by
   RFC 2301 "File Format for Internet Fax" [TIFF-FX].

   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.

3.1 TIFF-FX Scope

   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.

   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.

3.2 TIFF-FX Features

   Some of the features of TIFF-FX are:

      -  TIFF-FX is capable of describing bilevel, grayscale, palette-
         color, full-color and mixed content image data.

      -  TIFF-FX includes a number of compression schemes that allow
         developers to choose the best space or time tradeoff for their
         applications.

      -  TIFF-FX is designed to be extensible and to evolve gracefully
         as new needs arise.









McIntyre, et. al.           Standards Track                     [Page 2]

RFC 3250                     image/tiff-fx                September 2002


4. MIME Definition

   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.

5. IANA Registration

   To: ietf-types@iana.org
   Subject: Registration of Standard MIME media type image/tiff-fx

   MIME media type name: image

   MIME subtype name: tiff-fx

   Required parameters: none

   Optional parameters: none

   Encoding Considerations: This media type consists of binary
   data.  The base64 encoding should be used on transports that
   cannot accommodate binary data directly.

   Security considerations:

      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 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.





McIntyre, et. al.           Standards Track                     [Page 3]

RFC 3250                     image/tiff-fx                September 2002


   Interoperability considerations:

      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.

   Published specification:

      TIFF-FX (Tag Image File Format Fax eXtended) is defined in:

      RFC 2301 "File Format for Internet Fax", January 1998
      McIntyre, L., Zilles, S., Buckley, R., Venable, D.,
      Parsons, G., and J. Rafferty.

   Applications which use this media type:

      Imaging, fax, messaging and multi-media

   Additional information:

      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:

      Lloyd McIntyre
      lmcintyre@xerox.com

      Glenn W. Parsons
      gparsons@nortelnetworks.com

      James Rafferty
      jraff@brooktrout.com

   Intended usage: COMMON

   Change controller: Lloyd McIntyre









McIntyre, et. al.           Standards Track                     [Page 4]

RFC 3250                     image/tiff-fx                September 2002


6. Security Considerations

   Security issues for this media type are discussed in the security
   considerations section of the media type registration that appears in
   section 5.

7. References

   [REQ]     Bradner, S., "Key words for use in RFCs to Indicate
             Requirement Levels", BCP 14, RFC 2119, March 1997.

   [MIME1]   Freed, N. and N. Borenstein, "Multipurpose Internet Mail
             Extensions (MIME) Part One: Format of Internet Message
             Bodies", RFC 2045, November 1996.

   [MIME4]   Freed, N. and N. Borenstein, "Multipurpose Internet Mail
             Extensions (MIME) Part Four: Registration Procedures", BCP
             13, RFC 2048, November 1996.

   [TIFF]    Adobe Developers Association, TIFF (TM) Revision 6.0 -
             Final, June 3, 1992.

   [TPC.INT] C. Malamud, M. Rose, "Principles of Operation for the
             TPC.INT Subdomain:  Remote Printing -- Technical
             Procedures", RFC 1528, 10/06/1993

   [TIFF-FX] McIntyre, L., Zilles, S., Buckley, R., Venable, D.,
             Parsons, G. and J. Rafferty, "File Format for Internet
             Fax", RFC 2301, January 1998.






















McIntyre, et. al.           Standards Track                     [Page 5]

RFC 3250                     image/tiff-fx                September 2002


Annex A. List of edits to TIFF-FX Registration

   +----+---------+-------------------------------------------------+
   | No.| Section |           Edit Nov. 21, 2000                    |
   +----+---------+-------------------------------------------------+
   | 1. | 7.0     | Corrected Magic Number from 49 49 42 00 hex and |
   |    |         | 4D 4D 00 42 hex to 49 49 2A 00 hex and          |
   |    |         | 4D 4D 00 2A hex respectively.                   |
   +----+---------+-------------------------------------------------+

Authors' Addresses

   Lloyd McIntyre
   Xerox Corporation
   3400 Hillview Avenue
   Palo Alto, CA 94304
   USA

   Phone: +1-650 813 6762
   Fax:   +1-650 813 5850
   EMail: lmcintyre@pahv.xerox.com


   Glenn W. Parsons
   Nortel Networks
   P.O. Box 3511, Station C
   Ottawa, ON  K1Y 4H7
   Canada

   Phone: +1-613-763-7582
   Fax:   +1-613-763-2697
   EMail: gparsons@nortelnetworks.com


   James Rafferty
   Brooktrout Technology
   410 First Avenue
   Needham, MA  02494
   USA

   Phone: +1-781-433-9462
   Fax:   +1-781-433-9268
   EMail: jraff@brooktrout.com








McIntyre, et. al.           Standards Track                     [Page 6]

RFC 3250                     image/tiff-fx                September 2002


Full Copyright Statement

   Copyright (C) The Internet Society (2002).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works.  However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
   Internet organizations, except as needed for the purpose of
   developing Internet standards in which case the procedures for
   copyrights defined in the Internet Standards process must be
   followed, or as required to translate it into languages other than
   English.

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.

   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society.



















McIntyre, et. al.           Standards Track                     [Page 7]