2009.02.13 03:24 "[Tiff] 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