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February 2009
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2009.02.13 21:34 "Re: TIFFReadRGBAImage w/ 8bit-gray + aplha", by Frank Warmerdam
Joris Van Damme (AWare Systems) wrote: > Chris, > >> i've tested with a clean copy of LibTiff v3.7.1, using the code >> below, and my own slightly tweaked version of v3.8.2 - same crash. > > I've tested with current beta of LibTiff 4. Low-level LibTiff > (TIFFReadEncodedXxx) does not get into trouble. However, the LibTiff RGBA > interface does crash and burn, access violation style, even in version 4.0. > At first examination, there's nothing that much out of the ordinary to this > image, except that the two channels (MinIsBlack grayscale channel and the > pre-calculated alpha channel) are stored planar, not chunky (in LibTiff > speak, the tag TIFFTAG_PLANARCONFIG has the value PLANARCONFIG_SEPARATE) > which is not all that common but certainly is perfectly legit. Folks, As Joris supposed, the problem was that the RGBA (tif_getimage.c) logic did not have appropriate handling for grey+alpha separated files. I have added this though I suspect that separated palette + alpha files still don't work. As always, the RGBA interface is a work in progress. But even when it does not work, is should not crash! http://bugzilla.maptools.org/show_bug.cgi?id=2006 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