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March 2005
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2005.03.22 22:41 "Re: tif_jpeg.c and 12bit JPEG Files", by Bob Friesenhahn
On Tue, 22 Mar 2005, Frank Warmerdam wrote: > > On Tue, 22 Mar 2005 15:59:02 -0600 (CST), Bob Friesenhahn wrote: > > > > I just verified your updates against IJG JPEG 6b (not the Mk1 version) > > built at 12 bits and am happy to report that it almost works! I say > > *almost* since the image appears as if the red and green samples have > > been interchanged. Trees and grass in the image are shown as red. > > Hmm, odd. I tried with a 12bit jpeg encoded TIFF file with the IJG 6b > code build in 12bit mode, and the colors displayed fine. I wonder if > this is a platform endianness issue. Are you working on a big endian > system? Can you provide your file? Unfortunately I cannot provide > my test data as it is under NDA, and I can't generate data since the > write paths are not working. Unfortunately, I obtained my file under similar terms. The person who provided me with the file has likely never seen what it is supposed to look like either. I am doing my testing on a big-endian machine. It is quite possible that there is an endianness issue. It took me a while to get to this point so I am not readily prepared to test on a little-endian machine. As a point of reference, the pixel read rate was 1.2m pixels/second on my machine. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/