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From the README file in the free JPEG software.  Also there is a mailing list
at jpeg-info@uunet.uu.net


 REFERENCES
==========

The best and most readily available introduction to the JPEG compression
algorithm is Wallace's article in the April '91 CACM:
        Wallace, Gregory K.  "The JPEG Still Picture Compression Standard",
        Communications of the ACM, April 1991 (vol. 34 no. 4), pp. 30-44.
(Adjacent articles in that issue discuss MPEG motion picture compression,
applications of JPEG, and related topics.)  We highly recommend reading that
article before looking at any of the JPEG software.

For more detail about the JPEG standard you pretty much have to go to the
draft standard, which is not nearly as intelligible as Wallace's article.
The current version is ISO/IEC Committee Draft CD 10918-1 dated 1991-03-15.
The standard is not presently available electronically; you must order a paper
copy through ISO.

The JPEG standard does not specify all details of an interchangeable file
format.  For the omitted details we follow the "JFIF" conventions, revision
1.01.  A copy of the JFIF spec is available from:
        Literature Department
        C-Cube Microsystems, Inc.
        399A West Trimble Road
        San Jose, CA  95131
        (408) 944-6300
Requests can also be e-mailed to info@c3.pla.ca.us (this address good after
10/10/91).  The same source can supply copies of the draft JPEG-in-TIFF specs.

If you want to understand this implementation, start by reading the
"architecture" documentation file.  Please read "codingrules" if you want to
contribute any code.