AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

1994.07.12 19:43 "", by Vivek Khera
1994.07.12 16:59 "JPEG Compression in TIFF", by Niles Ritter
1994.07.13 15:04 "Re: JPEG Compression in TIFF", by Tom Lane

1994.07.12 16:59 "JPEG Compression in TIFF", by Niles Ritter

I just picked up TIFF 3.30beta ALPHA 002, and notice that there is only a stub for JPEG handling. Has anyone out there written the code to actually do the JPEG decompression/compression? If not, which of the free implementations of JPEG would be the best starting point? The IJG implementation claims that there are problems with TIFF6.0 and they are not going to support it now.

As several others will point out, there were indeed some serious problems with the JPEG implementation, which have been ironed out and submitted for revision with the Aldus TIFF Developers. Tom Lane <tgl@cs.cmu.edu> ran a mailing list for dealing with this problem; you may want to contact him to find out the current status of the revisions (actually, I'm pretty curious about the status myself--Tom?).

Our group at JPL managed to get the libtiff and the IJG libraries to cooperate enough to implement a JPEG compression close to the 6.0 spec, but you have to break things owing to the implementation flaws, so this is not (yet) a recommended approach, until the revised spec comes out.

--Niles