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March 2002

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2002.03.25 17:54 "TIFF w/JPEG to JPEG file?", by Michael O'rourke

2002.03.26 07:21 "Re: TIFF w/JPEG to JPEG file?", by Tom Lane

2002.03.26 07:21 "Re: TIFF w/JPEG to JPEG file?", by Tom Lane

"Michael O'Rourke" <morourke@adobe.com> writes:
> If I have Tiff files with Jpeg compression (in one strip), can the jpeg be
> stripped out without decompression and recompression into a jpeg file? I see
> there is a JPEG_TABLES tag and I'm guessing that the info is in such a
> different format in the Tiff file that maybe this cannot be done?

It's theoretically doable in most cases.  See 
ftp://ftp.uu.net/graphics/jpeg/TIFFTechNote2.txt.gz
for an excruciatingly complete discussion of the pitfalls.

If you're looking for canned source code, I'm afraid I don't have any.

			regards, tom lane
			organizer, Independent JPEG Group