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September 1993
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1993.09.07 23:21 "Re: JPEG in TIFF", by Sam Leffler
To: tiff@sgi.sgi.com
Subject: JPEG in TIFF
From: danlip@cns.caltech.edu (Dan Lipofsky)
Date: Tue, 07 Sep 1993 14:23:29 PDT
I hope I am not annoying people by asking FAQs.
If I am, just point me to a FAQ guide. Thanks.
I want to do JPEG compression inside a TIFF file.
I see there are tags for doing so, but I am unclear
how to proceed beyond this. Sam Leffler's nifty TIFF
library doesn't appear to have code to do this, at least
in the version I picked up a few months ago. Is there code
out there to do this, preferably that fits with the library?
Yes, but not publicly available.
Also, do any TIFF readers currently read JPEG? XV doesn't
seem to. I would like other people to be able to read the
files I produce.
Yes, but they are commercial. NeXTStep, for example,
supports JPEG-in-TIFF according to the 6.0 spec and their
implementation is derived from my library.
Has anyone here done JPEG using JFIF? This seems to be the more
popular way to do JPEG, but it appears to be a fairly stripped
format. I would like to be able to include in the header my own
information (like ASCII strings to describe the image) but I have
no clue if this is possible or not.
There is a separate mailing list of people that is discussing how to
revise the JPEG-related aspects of the 6.0 specification to resolve
problems and ambiguities. When that work is completed there will
likely be JPEG-in-TIFF support for my library that is based on the
Independent JPEG Group's software. If you believe that you have
something to contribute to this work, then you should contact
listserver@cs.columbia.edu to get on the JPEG-specific mailing list
(if this is wrong, I figure that Tom Lane will correct me.)
Sam