Tag Image File Format (TIFF) - image/tiff MIME Sub-type Registration
RFC 2302

Document Type RFC - Proposed Standard (March 1998; No errata)
Obsoleted by RFC 3302
Last updated 2013-03-02
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Network Working Group                                         G. Parsons
Request for Comments: 2302                              Northern Telecom
Category: Standards Track                                    J. Rafferty
                                                    Human Communications
                                                               S. Zilles
                                                     Adobe Systems, Inc.
                                                              March 1998

               Tag Image File Format (TIFF) - image/tiff
                       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 (1998).  All Rights Reserved.

Overview

   This document describes the registration of the MIME sub-type
   image/tiff.  The baseline encoding is defined by [TIFF].

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>.

1. Abstract

   This document describes the registration of the MIME sub-type
   image/tiff.  The baseline encoding is defined by [TIFF].  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:

Parsons, et. al.            Standards Track                     [Page 1]
RFC 2302                          TIFF                        March 1998

     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/
   tiff6.pdf

   While a brief scope and feature description is provided in this
   section as background information, the reader is directed to the
   original TIFF specification [TIFF] to obtain complete feature and
   technical details.

 2.1 TIFF Scope

   TIFF describes image data that typically comes from scanners, frame
   grabbers, and paint- and photo-retouching programs. TIFF is not a
   printer language or page description language. The purpose of TIFF is
   to describe and store raster image data.  A primary goal of TIFF is
   to provide a rich environment within which applications can exchange
   image data. This richness is required to take advantage of the
   varying capabilities of scanners and other imaging devices.  Though
   TIFF is a rich format, it can easily be used for simple scanners and
   applications as well because the number of required fields is small.

2.2 TIFF Features

   Some of the features of TIFF (from [TIFF]) are:

    - TIFF is capable of describing bilevel, grayscale, palette-color,
      and full-color image data in several color spaces.

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

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

    - TIFF allows the inclusion of an unlimited amount of private or
      special-purpose information.

Parsons, et. al.            Standards Track                     [Page 2]
RFC 2302                          TIFF                        March 1998

3. MIME Definition

3.1 image/tiff

   The image/tiff content-type was previously defined in RFC 1528 as
   containing TIFF 6.0 encoded image data, with specific reference made
   to a subset known as TIFF Class F.  This document re-defines the
   original image/tiff definition to refer to all of the profiles and
   extensions that build on TIFF 6.0 [TIFF] encoded image data,
   consistent with existing practice for TIFF aware Internet
   applications.  This definition is further enhanced by introducing the
   new "application parameter" (section 3.2) to enable identification of
   a specific subset of TIFF and TIFF extensions for the encoded image
   data.

3.2 Application parameter

   There are cases where it may be useful to identify the application
   applicable to the content of an image/tiff body.  Typically, this
   would be used to assist the recipient in dispatching a suitable
   rendering package to handle the display or processing of the image
   file.  As a result, an optional "application" parameter is defined
   for image/tiff to identify a particular application's subset of TIFF
   and TIFF extensions for the encoded image data, if it is known.  No
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