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September 2007

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2007.09.23 16:42 "G3 fax: EOL needed at the beginning of each strip?", by Comsquare Martin Osieka
2007.09.24 01:27 "Re: G3 fax: EOL needed at the beginning of each strip?", by Bob Friesenhahn
2007.09.24 05:56 "Re: G3 fax: EOL needed at the beginning of each strip?", by Joris Van Damme
2007.09.24 07:24 "Re: G3 fax: EOL needed at the beginning of each strip?", by Comsquare Martin Osieka
2007.09.24 07:51 "Re: G3 fax: EOL needed at the beginning of each strip?", by Joris Van Damme
2007.09.24 08:01 "Re: G3 fax: EOL needed at the beginning of each strip?", by Andy Cave
2007.09.24 08:32 "Re: G3 fax: EOL needed at the beginning of each strip?", by Joris Van Damme
2007.09.24 08:52 "Re: G3 fax: EOL needed at the beginning of each strip?", by Comsquare Martin Osieka
2007.09.24 08:58 "Re: G3 fax: EOL needed at the beginning of each strip?", by Andy Cave
2007.09.24 08:45 "Re: G3 fax: EOL needed at the beginning of each strip?", by Andy Cave
2007.09.24 09:03 "Re: G3 fax: EOL needed at the beginning of each strip?", by Joris Van Damme

2007.09.23 16:42 "G3 fax: EOL needed at the beginning of each strip?", by Comsquare Martin Osieka

I'm using libtiff 3.8.2 to decode tiffs containing fax images.
Recently I received TIFFs showing white lines in the image.
I decoded them and detected that only the first strip started with an EOL
but not the others.
The decoding of a strip always starts with SYNC_EOL() which eats up the
first line of the strip if there's no EOL.
The result is that at the end of the strip one line is missing, which is
filled up with white pixels.

I'm not sure what the TIFF specification tells. Do all strips have to start
with EOL?
Or should the decoder be more relaxed and check if a strip starts with an
EOL and skip it but not eating the line up to the first EOL?

Just to say these TIFFs do not show the white lines in tools provided with
Windows XP but in others like Irfanview and my tool.

Could anybody who is more experienced in this area provide a patch?

Martin