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1The Independent JPEG Group's JPEG software
2==========================================
3
4README for release 6a of 7-Feb-96
5=================================
6
7This distribution contains the sixth public release of the Independent JPEG
8Group's free JPEG software. You are welcome to redistribute this software and
9to use it for any purpose, subject to the conditions under LEGAL ISSUES, below.
10
11Serious users of this software (particularly those incorporating it into
12larger programs) should contact IJG at jpeg-info@uunet.uu.net to be added to
13our electronic mailing list. Mailing list members are notified of updates
14and have a chance to participate in technical discussions, etc.
15
16This software is the work of Tom Lane, Philip Gladstone, Luis Ortiz, Jim
17Boucher, Lee Crocker, Julian Minguillon, George Phillips, Davide Rossi,
18Ge' Weijers, and other members of the Independent JPEG Group.
19
20IJG is not affiliated with the official ISO JPEG standards committee.
21
22
23DOCUMENTATION ROADMAP
24=====================
25
26This file contains the following sections:
27
28OVERVIEW General description of JPEG and the IJG software.
29LEGAL ISSUES Copyright, lack of warranty, terms of distribution.
30REFERENCES Where to learn more about JPEG.
31ARCHIVE LOCATIONS Where to find newer versions of this software.
32RELATED SOFTWARE Other stuff you should get.
33FILE FORMAT WARS Software *not* to get.
34TO DO Plans for future IJG releases.
35
36Other documentation files in the distribution are:
37
38User documentation:
39 install.doc How to configure and install the IJG software.
40 usage.doc Usage instructions for cjpeg, djpeg, jpegtran,
41 rdjpgcom, and wrjpgcom.
42 *.1 Unix-style man pages for programs (same info as usage.doc).
43 wizard.doc Advanced usage instructions for JPEG wizards only.
44 change.log Version-to-version change highlights.
45Programmer and internal documentation:
46 libjpeg.doc How to use the JPEG library in your own programs.
47 example.c Sample code for calling the JPEG library.
48 structure.doc Overview of the JPEG library's internal structure.
49 filelist.doc Road map of IJG files.
50 coderules.doc Coding style rules --- please read if you contribute code.
51
52Please read at least the files install.doc and usage.doc. Useful information
53can also be found in the JPEG FAQ (Frequently Asked Questions) article. See
54ARCHIVE LOCATIONS below to find out where to obtain the FAQ article.
55
56If you want to understand how the JPEG code works, we suggest reading one or
57more of the REFERENCES, then looking at the documentation files (in roughly
58the order listed) before diving into the code.
59
60
61OVERVIEW
62========
63
64This package contains C software to implement JPEG image compression and
65decompression. JPEG (pronounced "jay-peg") is a standardized compression
66method for full-color and gray-scale images. JPEG is intended for compressing
67"real-world" scenes; line drawings, cartoons and other non-realistic images
68are not its strong suit. JPEG is lossy, meaning that the output image is not
69exactly identical to the input image. Hence you must not use JPEG if you
70have to have identical output bits. However, on typical photographic images,
71very good compression levels can be obtained with no visible change, and
72remarkably high compression levels are possible if you can tolerate a
73low-quality image. For more details, see the references, or just experiment
74with various compression settings.
75
76This software implements JPEG baseline, extended-sequential, and progressive
77compression processes. Provision is made for supporting all variants of these
78processes, although some uncommon parameter settings aren't implemented yet.
79For legal reasons, we are not distributing code for the arithmetic-coding
80variants of JPEG; see LEGAL ISSUES. We have made no provision for supporting
81the hierarchical or lossless processes defined in the standard.
82
83We provide a set of library routines for reading and writing JPEG image files,
84plus two sample applications "cjpeg" and "djpeg", which use the library to
85perform conversion between JPEG and some other popular image file formats.
86The library is intended to be reused in other applications.
87
88In order to support file conversion and viewing software, we have included
89considerable functionality beyond the bare JPEG coding/decoding capability;
90for example, the color quantization modules are not strictly part of JPEG
91decoding, but they are essential for output to colormapped file formats or
92colormapped displays. These extra functions can be compiled out of the
93library if not required for a particular application. We have also included
94"jpegtran", a utility for lossless transcoding between different JPEG
95processes, and "rdjpgcom" and "wrjpgcom", two simple applications for
96inserting and extracting textual comments in JFIF files.
97
98The emphasis in designing this software has been on achieving portability and
99flexibility, while also making it fast enough to be useful. In particular,
100the software is not intended to be read as a tutorial on JPEG. (See the
101REFERENCES section for introductory material.) Rather, it is intended to
102be reliable, portable, industrial-strength code. We do not claim to have
103achieved that goal in every aspect of the software, but we strive for it.
104
105We welcome the use of this software as a component of commercial products.
106No royalty is required, but we do ask for an acknowledgement in product
107documentation, as described under LEGAL ISSUES.
108
109
110LEGAL ISSUES
111============
112
113In plain English:
114
1151. We don't promise that this software works. (But if you find any bugs,
116 please let us know!)
1172. You can use this software for whatever you want. You don't have to pay us.
1183. You may not pretend that you wrote this software. If you use it in a
119 program, you must acknowledge somewhere in your documentation that
120 you've used the IJG code.
121
122In legalese:
123
124The authors make NO WARRANTY or representation, either express or implied,
125with respect to this software, its quality, accuracy, merchantability, or
126fitness for a particular purpose. This software is provided "AS IS", and you,
127its user, assume the entire risk as to its quality and accuracy.
128
129This software is copyright (C) 1991-1996, Thomas G. Lane.
130All Rights Reserved except as specified below.
131
132Permission is hereby granted to use, copy, modify, and distribute this
133software (or portions thereof) for any purpose, without fee, subject to these
134conditions:
135(1) If any part of the source code for this software is distributed, then this
136README file must be included, with this copyright and no-warranty notice
137unaltered; and any additions, deletions, or changes to the original files
138must be clearly indicated in accompanying documentation.
139(2) If only executable code is distributed, then the accompanying
140documentation must state that "this software is based in part on the work of
141the Independent JPEG Group".
142(3) Permission for use of this software is granted only if the user accepts
143full responsibility for any undesirable consequences; the authors accept
144NO LIABILITY for damages of any kind.
145
146These conditions apply to any software derived from or based on the IJG code,
147not just to the unmodified library. If you use our work, you ought to
148acknowledge us.
149
150Permission is NOT granted for the use of any IJG author's name or company name
151in advertising or publicity relating to this software or products derived from
152it. This software may be referred to only as "the Independent JPEG Group's
153software".
154
155We specifically permit and encourage the use of this software as the basis of
156commercial products, provided that all warranty or liability claims are
157assumed by the product vendor.
158
159
160ansi2knr.c is included in this distribution by permission of L. Peter Deutsch,
161sole proprietor of its copyright holder, Aladdin Enterprises of Menlo Park, CA.
162ansi2knr.c is NOT covered by the above copyright and conditions, but instead
163by the usual distribution terms of the Free Software Foundation; principally,
164that you must include source code if you redistribute it. (See the file
165ansi2knr.c for full details.) However, since ansi2knr.c is not needed as part
166of any program generated from the IJG code, this does not limit you more than
167the foregoing paragraphs do.
168
169The configuration script "configure" was produced with GNU Autoconf. It
170is copyright by the Free Software Foundation but is freely distributable.
171
172It appears that the arithmetic coding option of the JPEG spec is covered by
173patents owned by IBM, AT&T, and Mitsubishi. Hence arithmetic coding cannot
174legally be used without obtaining one or more licenses. For this reason,
175support for arithmetic coding has been removed from the free JPEG software.
176(Since arithmetic coding provides only a marginal gain over the unpatented
177Huffman mode, it is unlikely that very many implementations will support it.)
178So far as we are aware, there are no patent restrictions on the remaining
179code.
180
181WARNING: Unisys has begun to enforce their patent on LZW compression against
182GIF encoders and decoders. You will need a license from Unisys to use the
183included rdgif.c or wrgif.c files in a commercial or shareware application.
184At this time, Unisys is not enforcing their patent against freeware, so
185distribution of this package remains legal. However, we intend to remove
186GIF support from the IJG package as soon as a suitable replacement format
187becomes reasonably popular.
188
189We are required to state that
190 "The Graphics Interchange Format(c) is the Copyright property of