LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
December 2001
Previous Thread
Next Thread
Previous by Thread
Next by Thread
Previous by Date
Next by Date
Contact
The TIFF Mailing List Homepage
This list is run by Frank Warmerdam
Archive maintained by AWare Systems
Thread
2001.12.14 01:42 "Re: jpeg in tiff problem", by Tom Lane
Frank Warmerdam <warmerdam@pobox.com> writes: > The file doesn't have a YCbCr sampling value in the TIFF directory, so the > library defaults to 2,2. However, the header of the jpeg data stream > indicates a 2,1 sampling. Thus the error. Sigh ... another implementor who didn't read the spec, and couldn't be bothered to do any cross-testing. > I tried overriding the default sampling value with the value in the jpeg > data stream and that seemed to work, so I have modified tif_jpeg.c to > always do this if they differ, and to just issue a warning instead of an > error. Seems a reasonable hack. But no doubt someday we'll see another broken implementation where the opposite "fix" is needed to read its output. I trust the warning is not easily silenced? In the meantime, nastygrams to imagegear are definitely in order. If they want to argue that their code conforms to TTN#2, tell 'em to take it up with me. regards, tom lane organizer, Independent JPEG Group