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March 2005
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2005.03.07 22:36 "Re: Problem decoding G4 FAX tiffs", by Frank Warmerdam
On Tue, 8 Mar 2005 09:16:57 +1100, Jonathan Potter <jon@gpsoft.com.au> wrote: > > We have received a complaint from one of our users that our software (which > utilises libtiff) is not able to properly display his fax images, although > the Windows Fax Viewer is able to display them perfectly. Jonathan, Like Bob, I had no problem displaying it with current CVS libtiff. I did notice that your no_show.png looks a bit like an alignment problem and that the image is an odd width (not a multiple of 8). Any chance your higher level code has problems unpacking bit data that isn't an even multiple of 8 so that it fits into bytes nicely? In addition to upgraded to the latest libtiff from CVS (or at least the latest public release), I would encourage you to try converting the file to RGBA with tiff2rgba to see if that works. Also, you really ought to explain what libtiff interfaces you are using to read the file (the RGBA interface? TIFFReadScanline())? Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent