2005.12.05 13:49 "Re: [Tiff] Incorrect rendering of tif-images by libtiff 3.7.2", by Joris Van Damme

I exported a Pixel image as a tiff-image using that application; you can see the file at http://www.linopus.de/debian/pixeltest.tif

ImageWidth (1 Long): 640
ImageLength (1 Long): 480
ResolutionUnit (1 Short): Inch
BitsPerSample (3 Short): 8, 8, 8
Compression (1 Short): Uncompressed
Photometric (1 Short): RGB

StripOffsets (30 Long): 380, 31100, 61820, 92540, 123260, 153980,... SamplesPerPixel (1 Short): 3

RowsPerStrip (1 Short): 16

StripByteCounts (30 Long): 380, 31100, 61820, 92540, 123260, 153980,...

You can easilly see what's wrong with it: the StripByteCounts values are incorrectly identical to the StripOffsets value. Haven't really got time right now to try, but I suspect that if you calculate correct value of StripByteCounts, which should be easy since this TIFF does not use any compression, and correct the StripByteCounts value, everything would work fine.

The fact that some applications render this TIFF, is probably simply because they apply some robust StripByteCounts value correction in a case like this.

Joris Van Damme
info@awaresystems.be
http://www.awaresystems.be/
Download your free TIFF tag viewer for windows here:
http://www.awaresystems.be/imaging/tiff/astifftagviewer.html