One document matched: draft-ietf-fax-tiff-reg-00.txt

  Network Working Group                                    Glenn Parsons
  Internet Draft                                          James Rafferty
  Expires in six months                                     May 30, 1997


               Tag Image File Format (TIFF) - image/TIFF
                      MIME Sub-type Registration
                                   
                   <draft-ietf-fax-tiff-reg-00.txt>
                                   
  Status of this Memo
  
  This document is an Internet Draft.  Internet Drafts are working
  documents of the Internet Engineering Task Force (IETF), its Areas,
  and its Working Groups.  Note that other groups may also distribute
  working documents as Internet Drafts.
  
  Internet Drafts are valid for a maximum of six months and may be
  updated, replaced, or obsoleted by other documents at any time.  It
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  munnari.oz.au (Pacific Rim), ds.internic.net (US East Coast), or
  ftp.isi.edu (US West Coast).
  
  Overview
  
  This document describes the registration of the MIME sub-type
  image/tiff.  The baseline encoding is defined by [TIFF] and a common
  Internet fax format is defined in [TIFF-F].
  
  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>.
  


     Internet Draft                  TIFF-F                    May 30, 1997


 1. Abstract
  
  
  This document describes the registration of the MIME sub-type
  image/tiff.  The baseline encoding is defined by [TIFF] and a common
  Internet fax format is defined in [TIFF-F].  This document refines
  an earlier sub-type registration in RFC 1528 [TPC.INT].
  
  
 2. TIFF Definition
  
  
  TIFF (Tag Image File Format) Revision 6.0 is defined in detail by
  Adobe in [TIFF].  The documentation can be obtained from Adobe at:
  
     Adobe Developers Association
     Adobe Systems Incorporated
     345 Park Avenue
     San Jose, CA 95110-2704
     
     Phone: +1-408-536-6000
     Fax:   +1-408-537-6000
     
  A copy of this specification can also be found in:
  ftp://ftp.adobe.com/pub/adobe/devrelations/devtechnotes/pdffiles/tif
  f6.pdf
  
  
 2.1 TIFF-F Definition
  
  
  Though it has been in common usage for many years, TIFF-F has
  previously never been documented in the form of a standard.  An
  informal TIFF-F document was originally created by a small group of
  fax experts led by Joe Campbell.  The existence of TIFF-F is noted
  in [TIFF] but it is not defined.  The formal definition for TIFF-F
  for Internet applications can be found in [TIFF-F].
  
  
 3. MIME Definition
  
  
 3.1 image/TIFF
  
  
  The image/TIFF sub-type was originally defined in RFC 1528 as
  containing TIFF 5.0 encoded image data.  This document re-defines
  the original image/TIFF definition to refer to TIFF 6.0 encoded
  image data.  The TIFF 6.0 specification is a cleaner document and is
  compatible with previous TIFF 5.0 encoded image data.


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     Internet Draft                  TIFF-F                    May 30, 1997


 3.2 Application parameter
  
  
  Up until TIFF 6.0, TIFF supported various "Classes" which defined
  the use of TIFF for various applications.   The intent of Classes
  had been to reduce the information burden on TIFF readers and
  writers that wished to support narrow applications.
  
  There are it cases where it may be useful to identify the
  application applicable to the content of an image/TIFF body.  As a
  result, an optional "application" parameter is defined for
  image/TIFF to identify the TIFF application of the encoded image
  data, if it is known.
  
  TIFF-F [TIFF-F] has been known historically as "TIFF Class F" and
  previous informal TIFF-F documents used this terminology.  This
  document defines the application parameter value "F" to correspond
  to a bi-level facsimile image defined by [TIFF-F].
  
  Example:
  
            Content-type: image/TIFF; application=F
  
  There is no default value for application, as the absence of the
  application parameter indicates that the encoded TIFF image is
  Baseline TIFF or that it is not necessary to identify the
  application.   It is up to the implementation to determine the
  application (if necessary) and present the image to the user.
  
  
 3.3 Interoperability considerations
  
  
  The ability of implementations to handle all the defined
  applications of TIFF may not be ubiquitous.  As a result, the
  absence of the application parameter would force implementations to
  decode and attempt to display the encoded TIFF image data in order
  to determine if it could actually be viewed.
  

 4.  IANA Registration
  
  
       To: ietf-types@iana.org
       Subject: Registration of Standard MIME media type image/TIFF
  
       MIME media type name: image
  
       MIME subtype name: TIFF
  
       Required parameters: none


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     Internet Draft                  TIFF-F                    May 30, 1997


       Optional parameters: application
  
          The applications of TIFF are denoted by letters.  A single
          application is defined here for TIFF-F as follows:
          
               F - Bi-Level Facsimile
          
          There is no default value for application, as the absence of
          the application parameter indicates that the encoded TIFF
          image is Baseline TIFF or that it is not necessary to
          identify the application.  It is up to the implementation to
          determine the application (if necessary) and present the
          image to the user.
  
       Encoding considerations: Binary or Base-64 generally preferred
  
       Security considerations: none
  
       Interoperability considerations:
  
          The ability of implementations to handle all the defined
          applications of TIFF may not be ubiquitous.  As a result,
          the absence of the application parameter would force
          implementations to decode and attempt to display the encoded
          TIFF image data in order to determine if it could actually
          be viewed.
  
       Published specification:
  
          TIFF (Tag Image File Format) is defined in:
             TIFF (TM) Revision 6.0 - Final - June 3, 1992
          
          Adobe Developers Association
          Adobe Systems Incorporated
          345 Park Avenue
          San Jose, CA 95110-2704
          
          Phone: +1-408-536-6000
          Fax:   +1-408-537-6000
          
          A copy of this specification can be found in:
          ftp://ftp.adobe.com/pub/adobe/devrelations/devtechnotes/pdff
          iles/tiff6.pdf
          
          TIFF-F is defined in [TIFF-F]
  
       Applications which use this media type:
  
          primarily fax and voice messaging
  
       Additional information:
  
         Magic number(s):
              II (little-endian):  49 49 42 00 hex
              MM (big-endian):     4D 4D 00 42 hex
         File extension(s): .TIF
         Macintosh File Type Code(s): TIFF

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     Internet Draft                  TIFF-F                    May 30, 1997


       Person & email address to contact for further information:
  
         Glenn W. Parsons
         Glenn.Parsons@Nortel.ca
  
         James Rafferty
         Jrafferty@worldnet.att.net
  
       Intended usage: COMMON
  
       Author/Change controller:
  
         James Rafferty
  
  
 5. Authors' Addresses
  
  
  Glenn W. Parsons
  Nortel Technology
  P.O. Box 3511, Station C
  Ottawa, ON  K1Y 4H7
  Canada
  Phone: +1-613-763-7582
  Fax:   +1-613-763-8385
  Email: Glenn.Parsons@Nortel.ca
  
  James Rafferty
  Human Communications
  12 Kevin Drive
  Danbury, CT 06811-2901
  USA
  Phone: +1-203-746-4367
  Fax:   +1-203-746-4367
  Email: Jrafferty@worldnet.att.net
  
  
 6. References
  
 
  [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.
  [TIFF-F] G. Parsons and J. Rafferty, " Tag Image File Format (TIFF)
       - Application F", Work In Progress, <draft-ietf-fax-tiff-
       02.txt>, May 1997.
  [TPC.INT] C. Malamud, M. Rose, "Principles of Operation for the
       TPC.INT Subdomain:  Remote Printing -- Technical Procedures",
       RFC 1528, 10/06/1993



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