A File Format for the Exchange of Images in the Internet (RFC1314)
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2000-Sep-12
Internet Society Requests For Comment (RFCs)
A. Katz: AUTHOR [+2]
This document defines a standard file format for the exchange of fax-like black and white images within the Internet. It is a product of the Network Fax Working Group of the Internet Engineering Task Force (IETF).
Network Working Group A. Katz
Request for Comments: 1314 D. Cohen
A File Format for the Exchange of Images in the Internet
Status of This Memo
This document specifies an IAB standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "IAB
Official Protocol Standards" for the standardization state and status
of this protocol. Distribution of this memo is unlimited.
This document defines a standard file format for the exchange of
fax-like black and white images within the Internet. It is a product
of the Network Fax Working Group of the Internet Engineering Task
The standard is:
** The file format should be TIFF-B with multi-page files
supported. Images should be encoded as one TIFF strip
** Images should be compressed using MMR when possible. Images
may also be MH or MR compressed or uncompressed. If MH or MR
compression is used, scan lines should be "byte-aligned".
** For maximum interoperability, image resolutions should
either be 600, 400, or 300 dpi; or else be one of the
standard Group 3 fax resolutions (98 or 196 dpi
vertically and 204 dpi horizontally).
Note that this specification is self contained and an implementation
should be possible without recourse to the TIFF references, and that
only the specific TIFF documents cited are relevant to this
specification. Updates to the TIFF documents do not change this
Experimentation with this file format specified here is encouraged.
The purpose of this document is to define a standard file format for
exchange of black and white images using the Internet. Since many
organizations have already started to accumulate and exchange scanned
documents it is important to reach agreement about an interchange
file format in order to promote and facilitate the exchange and
distribution of such documents. These images may originate from
scanners, software, or facsimile (fax) machines. They may be
manipulated by software, communicated, shared, duplicated, displayed,
printed by laser printers, or faxed.
This file format provides for the uniform transfer of high quality
images at a reasonable cost and with reasonable speed whether these
files are generated by scanners, totally by software (e.g., text-to-
fax, bitmap-to-fax, OCR, etc), or by fax. Also the intent of this
document is to remain compatible with future moves to multi-level
(i.e., gray-scale), higher resolution, or color images. The format
proposed here is supported by both commercially available hardware