WDIFF

draft-ietf-fax-tiff-reg-00.txt --> draft-ietf-fax-tiff-reg-01.txt

Network Working Group Glenn Parsons
Internet Draft James Rafferty
Expires in six months May 30, July 29, 1997

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

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

<draft-ietf-fax-tiff-reg-01.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
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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]. [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>.

Internet Draft TIFF-F May 30, July 29, 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]. [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:

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
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-F Definition 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 has been in common usage can easily be used for many years, TIFF-F has
previously never been documented in simple
scanners and applications as well because the form number of a standard. An
informal TIFF-F document was originally created by a small group required
fields is small.

2.2 TIFF Features

Some of
fax experts led by Joe Campbell. The existence the features of TIFF-F TIFF (from [TIFF]) are:

- TIFF is noted capable of describing bilevel, grayscale, palette-color,
and full-color image data in [TIFF] but it is not defined. The formal definition for several color spaces.

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Internet Draft TIFF-F July 29, 1997

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

- TIFF is designed to be found in [TIFF-F]. extensible and to evolve gracefully as new
needs arise.

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

3. MIME Definition

3.1 image/TIFF image/tiff

The image/TIFF image/tiff sub-type was originally previously defined in RFC 1528 as
containing TIFF 5.0 encoded image data. This document re-defines
the original image/TIFF image/tiff definition to refer to TIFF 6.0 encoded
image data. The TIFF 6.0 specification [TIFF] is a cleaner document
and is compatible with previous TIFF 5.0 encoded image data.

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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 image/tiff body. As a result, an
optional "application" parameter is defined for
image/TIFF 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 No values are defined by [TIFF-F]. in this document.

Example:

Content-type: image/TIFF; application=F image/tiff; application=foo

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 image/tiff

MIME media type name: image

MIME subtype name: TIFF tiff

Required parameters: none

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Optional parameters: application

The

There is no format specified for the value of this parameter
in addition to that specified by [MIME1]. Various
applications of TIFF are denoted by letters. A single
application is defined here for TIFF-F may define values as follows:

F - Bi-Level Facsimile required. 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]
ftp://ftp.adobe.com/pub/adobe/devrelations/devtechnotes/
pdffiles/tiff6.pdf

Applications which use this media type:

primarily fax and voice

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): .TIF
Macintosh File Type Code(s): TIFF

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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

[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.
[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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