Tag Image File Format (TIFF) - F Profile for Facsimile
RFC 2306
Document | Type |
RFC - Informational
(March 1998; No errata)
Was draft-ietf-fax-tiff (fax WG)
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Authors | Glenn Parsons , James Rafferty | ||
Last updated | 2013-03-02 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 2306 (Informational) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | (None) | ||
Send notices to | (None) |
Network Working Group G. Parsons Request for Comments: 2306 Northern Telecom Category: Informational J. Rafferty Human Communications March 1998 Tag Image File Format (TIFF) - F Profile for Facsimile Status of this Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (1998). All Rights Reserved. Overview This document describes in detail the definition of TIFF-F that is used to store facsimile images. The TIFF-F encoding has been folklore with no standard reference definition before this document. 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 references the Tag Image File Format (TIFF) to define the F profile of TIFF for facsimile (TIFF-F) as a file format that may be used for the storage and interchange of facsimile images. 2. TIFF Definition TIFF (Tag Image File Format) Revision 6.0 is defined in detail within [TIFF]. A brief review of concepts used in TIFF is included in this document as background information, but the reader is directed to the original TIFF specification [TIFF] to obtain specific technical details. Parsons & Rafferty Informational [Page 1] RFC 2306 TIFF-F Profile March 1998 2.1 Baseline TIFF and Applications TIFF provides a method to describe and store raster image data. A primary goal of TIFF is to provide a rich environment within which implementations can exchange image data. [TIFF] characterizes Baseline TIFF as being the core of TIFF, the essentials that all mainstream TIFF developers should support in their products. Applications of TIFF are defined by using Baseline TIFF as a starting point and then defining "extensions" to TIFF that are used for the specific "application", as well as specifying any other differences from Baseline TIFF. 3. TIFF-F Definition 3.1 Introduction 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. This document defines the F application of [TIFF]. For ease of reference, the term TIFF-F will be used throughout this document as a shorthand for "F Profile of TIFF for Facsimile". TIFF-F files are intended for use with the image/tiff MIME media content-type which includes support for the "application" parameter (e.g., application=faxbw). 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 [REQ]. 3.1.1 TIFF-F Historical Background Up until TIFF 6.0, TIFF supported various "Classes" which defined the use of TIFF for various applications. Classes were used to support specific applications and in this spirit, TIFF-F has been known historically as "TIFF Class F". Previous informal TIFF-F documents used the "Class F" terminology. As of TIFF 6.0 [TIFF], the TIFF Class concept has been eliminated in favor of the concept of Baseline TIFF. Therefore, this document updates the definition of TIFF-F as the F profile of TIFF for facsimile, by using Baseline TIFF as defined in [TIFF] as the starting point and then defining the differences from Baseline TIFF which apply for TIFF-F. In almost all cases, the resulting definition of TIFF-F fields and values remains consistent with those used historically in earlier definitions of TIFF Class F. Where some Parsons & Rafferty Informational [Page 2] RFC 2306 TIFF-F Profile March 1998 of the values for fields have been updated to provide more precise conformance with the ITU-T [T.4] and [T.30] fax recommendations, these differences are noted. 3.1.2 Overview The intent of this specification is to document: 1) The fields and values which are applicable for this F profile of TIFF for facsimile. 2) A minimum set of TIFF-F fields and values which should be able to interwork with virtually all historic TIFF-F readers. 3) A broader range of values for the traditional TIFF-F fields that will provide support for the most widely used facsimileShow full document text