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TIFF and LibTiff Mail List Archive

Thread

1997.02.12 00:23 "TIFF 6.0 JPEG or OJPEG_SUPPORT", by Henri Schueler
1997.02.12 02:37 "Re: TIFF 6.0 JPEG or OJPEG_SUPPORT", by Tom Lane
1997.02.12 08:22 "Re: TIFF 6.0 JPEG or OJPEG_SUPPORT", by Henri Schueler
1997.02.12 16:24 "Re: TIFF 6.0 JPEG or OJPEG_SUPPORT", by Tom Lane
1997.02.12 03:56 "TIFF 6.0 JPEG or OJPEG_SUPPORT", by Ali Ozer

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