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Versions: 00 01 rfc3250                                                 
Network Working Group                                        L. McIntyre
Internet Draft                                         Xerox Corporation
Document: <draft-ietf-fax-tiff-fx-reg-00.txt>                G. Parsons
                                                         Nortel Networks
                                                             J. Rafferty
                                                   Brooktrout Technology
                                                        November 2, 2001


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

                  <draft-ietf-fax-tiff-fx-reg-00.txt>


Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   Internet-Drafts are working documents of the Internet Engineering
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1. Abstract

   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.



2.  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].

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3.  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.


4.  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>.


5.  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].

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

   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.


5.1  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.









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   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.

5.2  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.


6.  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.


7.  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: Binary or Base-64 generally preferred




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        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.

        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 42 00 hex
                MM (big-endian):     4D 4D 00 42 hex
           File extension(s): .TFX
           Macintosh File Type Code(s): TFX

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        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

8. References


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

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

   [MIME4] N. Freed and N. Borenstein,  "Multipurpose Internet Mail
        Extensions (MIME) Part Four: Registration Procedures", RFC
        2048, Innosoft, First Virtual, Nov 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.











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9. Author's 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

Full Copyright Statement

   Copyright (C) The Internet Society (2001). All Rights Reserved.

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   followed, or as required to translate it into languages other than
   English.




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   The limited permissions granted above are perpetual and will not be
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