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February 2009

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2009.02.13 03:24 "TIFFReadRGBAImage w/ 8bit-gray + aplha", by Chris Losinger

2009.02.13 08:50 "Re: TIFFReadRGBAImage w/ 8bit-gray + aplha", by Joris Van Damme

2009.02.13 17:36 "Re: TIFFReadRGBAImage w/ 8bit-gray + aplha", by Bob Friesenhahn

2009.02.13 21:34 "Re: TIFFReadRGBAImage w/ 8bit-gray + aplha", by Frank Warmerdam

2009.02.13 03:24 "TIFFReadRGBAImage w/ 8bit-gray + aplha", by Chris Losinger

	i have a TIFF: 8-bit grayscale w 8-bit alpha which i'm trying to 
read it with TIFFReadRGBAImage. unfortunately, i get an access 
violation inside the 'putgreytile' function.

	i don't know if the problem is common to all gray+alpha images or 
just this one, so here's a link to the image i'm testing with:

	http://www.smalleranimals.com/images/8gray_alpha.tif

	(warning, it's 3.55MB)

	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.
	
	any ideas ?

	-c

--------------
int
main(int argc, char* argv[])
{
      uint32* raster;
     uint32  width, height;
     uint32  row;

	 TIFF *in;
	in = TIFFOpen(argv[1], "r");

     TIFFGetField(in, TIFFTAG_IMAGEWIDTH, &width);
     TIFFGetField(in, TIFFTAG_IMAGELENGTH, &height);

     raster = (uint32*)_TIFFmalloc(width * height * sizeof (uint32));
     if (raster == 0) {
         TIFFError(TIFFFileName(in), "No space for raster buffer");
         return (0);
     }

     if (!TIFFReadRGBAImageOriented(in, width, height, raster,
                                    ORIENTATION_TOPLEFT, 0)) {
         _TIFFfree(raster);
         return (0);
     }

	 _TIFFfree( raster );
	(void) TIFFClose(in);
	return 0;
}
----
Chris Losinger
losinger@earthlink.net
smallest@smalleranimals.com          http://www.smalleranimals.com