1997.02.12 02:37 "Re: TIFF 6.0 JPEG or OJPEG_SUPPORT", by Tom Lane
I have some jpeg tiff images that were created on a NeXTStep computer.
tiffutil tells me they are 'Old-style JPEG', which is what I expect.
I'm not able to build the software in a way to read them.
libtiff does not have, and never has had, support for the TIFF 6.0 (old-style) JPEG definition. There are a few hooks where such support could be added, but nothing to hook onto them.
TIFF Tech Note #2 explains all the ambiguities and other problems with the 6.0 spec's handling of JPEG. Given those problems, I suspect Sam's not real interested in adding OJPEG support any more.
This of course leaves you with the problem of converting your NeXT files. Your best bet might be a self contained, quick-and-dirty program to extract the compressed data and write it out as a JFIF JPEG. This would be very easy if NeXT uses the "JPEGInterchangeFormat" convention, and probably not too much harder if it doesn't. But since I don't know just how NeXT interpreted the ambiguities in TIFF 6.0, I can't say exactly what you need to do.
Has anyone already looked at this problem and written a converter for NeXT TIFF/JPEG files?
regards, tom lane
organizer, Independent JPEG Group