The Internet Fax WG is meeting at the IETF meeting next Monday, March 19.
The IPP FAX UIF (Universal Image Format) standard is using TIFF/FX. It
would be good to get any additional features into TIFF/FX itself that IPP
Therefore, ASAP members of the IPP FAX group could send additional
requirements for the TIFF/FX extension work outlined below to the Internet
FAX (IFAX) WG using their DL:
(and cc to the email@example.com)
Possible additional requirements:
a. additional image resolutions, or are the resolutions already in the
TIFF-FX Extension Set 1 document sufficient (see mail note below)?
b. means to specify the media size by dimensions, instead of by name,
possibly using the new PWG Media Size string which has both name and two
dimensions in it, i.e., 'na-letter.8500-11000', 'iso-a4.2100-2970',
'na-custom-long-and-narrow.6000-14000' and 'custom-xyz.2000-3000'
c. additional color spaces, besides CIELAB. Possibilities include:
For Grayscale Images: Sample values in a grayscale (single-component) JPEG
image shall be converted to the sRGB color space by setting
Rout= Gout = Bout = Grayin
For Color Images: Sample values in 3-component JPEG images shall be
interpreted as YCbCr samples, as would be obtained by applying the matrices
described in ITU BT.601 to sRGB input data.
From: McIntyre, Lloyd [mailto:Lloyd.McIntyre@pahv.xerox.com]
Sent: Wednesday, March 07, 2001 17:34
To: 'PWG - IPPFax DL'; 'PWG - Don Wright (Chair)'
Subject: IFX> FW: I-D ACTION:draft-ietf-fax-tiff-fx-extension1-01.txt
Below is the IETF's announcement notice for the second draft of the first
extension set for TIFF-FX. This extension, TIFF-FX Extension Set 1, focuses
on introduction of the new JBIG2 encoding for B&W and colored text, see
sections E1.5, E1.6 and E1.7. JBIG2 provides 3 to 5x compression advantage
over G4 (MMR) and JBIG encodings. The extension also introduces a set of new
higher resolutions (e.g. 300x600, 400x800, 600x600, 600x1200 and 1200x1200
dpi) and associated image widths (section E1.3), provisions use more than 3
layers in MRC model of Profile M (section E1.4), and provision to signal
when more than one profile is being used within a file (section E1.2).
Please review and submit your comments on the IETF IFax Working Group dl at
From: Internet-Drafts@ietf.org [mailto:Internet-Drafts@ietf.org]
Sent: Tuesday, March 06, 2001 3:51 AM
Subject: I-D ACTION:draft-ietf-fax-tiff-fx-extension1-01.txt
A New Internet-Draft is available from the on-line Internet-Drafts
This draft is a work item of the Internet Fax Working Group of the IETF.
Title : TIFF-FX Extensions 1
Author(s) : L. McIntyre, D. Abercrombie, W. Rucklidge, R.
Filename : draft-ietf-fax-tiff-fx-extension1-01.txt
Pages : 62
Date : 05-Mar-01
This document is an Internet draft for extensions to TIFF-FX
[RFC XXXX], extension set 1.
A URL for this Internet-Draft is:
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This archive was generated by hypermail 2b29 : Fri Mar 16 2001 - 16:09:21 EST