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README for release 8b of 16-May-2010
This distribution contains the eighth public release of the Independent JPEG Group's free JPEG software. You are
welcome to redistribute this software and to use it for any purpose, subject to the conditions under LEGAL ISSUES,
below. This software is the work of Tom Lane, Guido Vollbeding, Philip Gladstone, Bill Allombert, Jim Boucher, Lee
Crocker, Bob Friesenhahn, Ben Jackson, Julian Minguillon, Luis Ortiz, George Phillips, Davide Rossi, Ge' Weijers,
and other members of the Independent JPEG Group. IJG is not affiliated with the official ISO JPEG standards
committee.
DOCUMENTATION ROADMAP
This file contains the following sections:
OVERVIEW General description of JPEG and the IJG software.
LEGAL ISSUES Copyright, lack of warranty, terms of distribution.
REFERENCES Where to learn more about JPEG.
ARCHIVE LOCATIONS Where to find newer versions of this software.
ACKNOWLEDGMENTS Special thanks.
FILE FORMAT WARS Software *not* to get.
TO DO Plans for future IJG releases.
Other documentation files in the distribution are:
User documentation:
• install.txt How to configure and install the IJG software.
• usage.txt Usage instructions for cjpeg, djpeg, jpegtran,
• rdjpgcom, and wrjpgcom.
• *.1 Unix-style man pages for programs (same info as usage.txt).
• wizard.txt Advanced usage instructions for JPEG wizards only.
• change.log Version-to-version change highlights.
Programmer and internal documentation:
• libjpeg.txt How to use the JPEG library in your own programs.
• example.c Sample code for calling the JPEG library.
• structure.txt Overview of the JPEG library's internal structure.
• filelist.txt Road map of IJG files.
• coderules.txt Coding style rules --- please read if you contribute code.
Please read at least the files install.txt and usage.txt. Some information can also be found in the JPEG FAQ
(Frequently Asked Questions) article. See ARCHIVE LOCATIONS below to find out where to obtain the FAQ
article.
If you want to understand how the JPEG code works, we suggest reading one or more of the REFERENCES, then
looking at the documentation files (in roughly the order listed) before diving into the code.
OVERVIEW
This package contains C software to implement JPEG image encoding, decoding, and transcoding. JPEG
(pronounced "jay-peg") is a standardized compression method for full-color and gray-scale images.
This software implements JPEG baseline, extended-sequential, and progressive compression
processes. Provision is made for supporting all variants of these processes, although some uncommon parameter
settings aren't implemented yet. We have made no provision for supporting the hierarchical or lossless processes
defined in the standard.