Re: Tiff error : unknown field with tag 317

[Charles Wilson <cygwin at cwilson dot fastmail dot fm>]

zze-BDE balg011 VAUCHER Laurent DvSI/SIReS/GRE wrote:

> TIFFReadDirectory: Warning, /usr/X11R6/GNUstep/Apps/WPrefs.app/
> tiff/expert.tiff: unknown field with tag 317 (0x13d) encountered.
>
>   According to the Tiff specs, tag 317 is for Predictor, and that
> seems to be used mainly by LZW compression. Might it be a 
> problem in the GIF library ?

TIFF can be compiled with, or without, LZW support.  Even though the US 
Patent on LZW compression expired on Sept 20 2003, the patent is still 
valid in several other countries.  Therefore, the cygwin version of TIFF 
as distributed does not support LZW, in order to avoid patent violations 
in those countries.

However, the TIFF -src package provides the patch and instructions for 
how to compile the code WITH LZW support, for your own personal use if 
you live in a country where the patent has expired or is not valid, or 
if you have purchased a license from Unisys Corp.

--
Chuck


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