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September 2009

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2009.09.14 00:51 "12 bit JPEG in TIFF", by Charles Auer

I was able to build the CVS version of LibTiff 4.0 with 2 linked copies of
LibJPEG (an 8 bit copy and a 12 bit copy) as described at:
 
http://trac.osgeo.org/gdal/wiki/TIFF12BitJPEG
 
I was able to find 12 bit JPEG in TIFF test images at 2 sites:
 
http://www.awaresystems.be/imaging/tiff/12bpsjpegintiff.zip
 
ftp://ftp.graphicsmagick.org/pub/outgoing/mandrill-12bit-JPEG-TIFF.zip
 
 
While I was able to decode the majority of these test images, one image in
particular has given me problems:
 
ITULAB.tif   (contained in the 12bpsjpegintiff.zip archive).  
 
I had no trouble decoding the other colorspace images (CMYK.tif,
Grayscale.tif, RGB.tif, or YCbCr.tif).  I think I could figure this out if I
had a more simple image to work with.  Has anyone constructed an 8 bit
ITULAB JPEG in TIFF image?
 
Charles