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From: pelcak@xyvision.com
To: tiff@sgi.com
Date: Fri, 23 May 1997 11:12:40 +5
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Subject: CCITT Grp 4 - uncompressed data
Cc: piercey@falcon.xyvision.com, devries@falcon.xyvision.com,
        shawn@falcon.xyvision.com
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After having gotten the most recent version of the TIFF library
(tiff-v3.4beta036), we have found that several of the graphics
in our graphic lib no longer work when converted to postscript.
The graphics all have in common CCITT Group 4,
min-is-white, Group 4 options: uncompressed data.

We tested those graphics with the most recent version of
"xv", which uses an older version of libtiff, and they
work fine with that. (xv uses  v3.3beta016).

Using tiff2ps with the new library produced
(among *many* others) the eror message
"Fax4Decode: ... Uncompressed data (not supported) ... ".
Inspection of the source code in tif_fax3.c showed that:

1. The encode/decode algorithm has been completely
re-done, to one "derived from Frank Cringle's viewfax";

2. The current code most certainly does not support
the uncompressed data option for CCITT Group 4.

Why is this option no longer supported?

Is there anything that we can do so that we can handle
CCITT Group 4 graphics using that option?

Thank you for any help you can provide.


Bob Pelcak
Xyvision, Inc.
Robert Pelcak
pelcak@xyvision.com
