You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
CyanWorlds e798bc4694 Merge "Open source re-licensing" into OpenUru base 13 years ago
..
Makefile.am Import modified jpeg-8c library. The library is modified to provide the 14 years ago
Makefile.in Import modified jpeg-8c library. The library is modified to provide the 14 years ago
README Import modified jpeg-8c library. The library is modified to provide the 14 years ago
README.CWE Import modified jpeg-8c library. The library is modified to provide the 14 years ago
aclocal.m4 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
ansi2knr.1 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
ansi2knr.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
cderror.h Import modified jpeg-8c library. The library is modified to provide the 14 years ago
cdjpeg.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
cdjpeg.h Import modified jpeg-8c library. The library is modified to provide the 14 years ago
change.log Import modified jpeg-8c library. The library is modified to provide the 14 years ago
cjpeg.1 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
cjpeg.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
ckconfig.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
coderules.txt Import modified jpeg-8c library. The library is modified to provide the 14 years ago
config.guess Merge "Open source re-licensing" into OpenUru base 13 years ago
config.sub Merge "Open source re-licensing" into OpenUru base 13 years ago
configure Merge "Open source re-licensing" into OpenUru base 13 years ago
configure.ac Import modified jpeg-8c library. The library is modified to provide the 14 years ago
depcomp Merge "Open source re-licensing" into OpenUru base 13 years ago
djpeg.1 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
djpeg.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
example.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
filelist.txt Import modified jpeg-8c library. The library is modified to provide the 14 years ago
install-sh Merge "Open source re-licensing" into OpenUru base 13 years ago
install.txt Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jaricom.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jcapimin.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jcapistd.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jcarith.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jccoefct.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jccolor.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jcdctmgr.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jchuff.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jcinit.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jcmainct.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jcmarker.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jcmaster.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jcomapi.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jconfig.bcc Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jconfig.cfg Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jconfig.dj Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jconfig.mac Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jconfig.manx Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jconfig.mc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jconfig.sas Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jconfig.st Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jconfig.txt Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jconfig.vc Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jconfig.vms Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jconfig.wat Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jcparam.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jcprepct.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jcsample.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jctrans.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdapimin.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdapistd.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdarith.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdatadst.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdatasrc.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdcoefct.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdcolor.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdct.h Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jddctmgr.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdhuff.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdinput.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdmainct.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdmarker.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdmaster.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdmerge.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdpostct.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdsample.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jdtrans.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jerror.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jerror.h Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jfdctflt.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jfdctfst.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jfdctint.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jidctflt.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jidctfst.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jidctint.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jinclude.h Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jmemansi.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jmemdos.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jmemdosa.asm Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jmemmac.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jmemmgr.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jmemname.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jmemnobs.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jmemsys.h Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jmorecfg.h Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jpegint.h Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jpeglib.h Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jpegtran.1 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jpegtran.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jquant1.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jquant2.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jutils.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
jversion.h Import modified jpeg-8c library. The library is modified to provide the 14 years ago
libjpeg.map Import modified jpeg-8c library. The library is modified to provide the 14 years ago
libjpeg.txt Import modified jpeg-8c library. The library is modified to provide the 14 years ago
ltmain.sh Merge "Open source re-licensing" into OpenUru base 13 years ago
makcjpeg.st Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makdjpeg.st Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makeadsw.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makeasln.v10 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makecdep.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makecdsp.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makecfil.v10 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makecmak.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makecvcx.v10 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makeddep.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makeddsp.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makedfil.v10 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makedmak.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makedvcx.v10 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makefile.ansi Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makefile.bcc Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makefile.dj Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makefile.manx Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makefile.mc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makefile.mms Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makefile.sas Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makefile.unix Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makefile.vc Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makefile.vms Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makefile.wat Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makejdep.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makejdsp.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makejdsw.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makejfil.v10 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makejmak.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makejsln.v10 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makejvcx.v10 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makeproj.mac Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makerdep.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makerdsp.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makerfil.v10 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makermak.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makervcx.v10 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
maketdep.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
maketdsp.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
maketfil.v10 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
maketmak.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
maketvcx.v10 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makewdep.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makewdsp.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makewfil.v10 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makewmak.vc6 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makewvcx.v10 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makljpeg.st Import modified jpeg-8c library. The library is modified to provide the 14 years ago
maktjpeg.st Import modified jpeg-8c library. The library is modified to provide the 14 years ago
makvms.opt Import modified jpeg-8c library. The library is modified to provide the 14 years ago
missing Merge "Open source re-licensing" into OpenUru base 13 years ago
rdbmp.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
rdcolmap.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
rdgif.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
rdjpgcom.1 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
rdjpgcom.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
rdppm.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
rdrle.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
rdswitch.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
rdtarga.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
structure.txt Import modified jpeg-8c library. The library is modified to provide the 14 years ago
testimg.ppm Import modified jpeg-8c library. The library is modified to provide the 14 years ago
transupp.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
transupp.h Import modified jpeg-8c library. The library is modified to provide the 14 years ago
usage.txt Import modified jpeg-8c library. The library is modified to provide the 14 years ago
wizard.txt Import modified jpeg-8c library. The library is modified to provide the 14 years ago
wrbmp.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
wrgif.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
wrjpgcom.1 Import modified jpeg-8c library. The library is modified to provide the 14 years ago
wrjpgcom.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
wrppm.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
wrrle.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago
wrtarga.c Import modified jpeg-8c library. The library is modified to provide the 14 years ago

README

The Independent JPEG Group's JPEG software
==========================================

README for release 8c of 16-Jan-2011
====================================

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.

We provide a set of library routines for reading and writing JPEG image files,
plus two sample applications "cjpeg" and "djpeg", which use the library to
perform conversion between JPEG and some other popular image file formats.
The library is intended to be reused in other applications.

In order to support file conversion and viewing software, we have included
considerable functionality beyond the bare JPEG coding/decoding capability;
for example, the color quantization modules are not strictly part of JPEG
decoding, but they are essential for output to colormapped file formats or
colormapped displays. These extra functions can be compiled out of the
library if not required for a particular application.

We have also included "jpegtran", a utility for lossless transcoding between
different JPEG processes, and "rdjpgcom" and "wrjpgcom", two simple
applications for inserting and extracting textual comments in JFIF files.

The emphasis in designing this software has been on achieving portability and
flexibility, while also making it fast enough to be useful. In particular,
the software is not intended to be read as a tutorial on JPEG. (See the
REFERENCES section for introductory material.) Rather, it is intended to
be reliable, portable, industrial-strength code. We do not claim to have
achieved that goal in every aspect of the software, but we strive for it.

We welcome the use of this software as a component of commercial products.
No royalty is required, but we do ask for an acknowledgement in product
documentation, as described under LEGAL ISSUES.


LEGAL ISSUES
============

In plain English:

1. We don't promise that this software works. (But if you find any bugs,
please let us know!)
2. You can use this software for whatever you want. You don't have to pay us.
3. You may not pretend that you wrote this software. If you use it in a
program, you must acknowledge somewhere in your documentation that
you've used the IJG code.

In legalese:

The authors make NO WARRANTY or representation, either express or implied,
with respect to this software, its quality, accuracy, merchantability, or
fitness for a particular purpose. This software is provided "AS IS", and you,
its user, assume the entire risk as to its quality and accuracy.

This software is copyright (C) 1991-2011, Thomas G. Lane, Guido Vollbeding.
All Rights Reserved except as specified below.

Permission is hereby granted to use, copy, modify, and distribute this
software (or portions thereof) for any purpose, without fee, subject to these
conditions:
(1) If any part of the source code for this software is distributed, then this
README file must be included, with this copyright and no-warranty notice
unaltered; and any additions, deletions, or changes to the original files
must be clearly indicated in accompanying documentation.
(2) If only executable code is distributed, then the accompanying
documentation must state that "this software is based in part on the work of
the Independent JPEG Group".
(3) Permission for use of this software is granted only if the user accepts
full responsibility for any undesirable consequences; the authors accept
NO LIABILITY for damages of any kind.

These conditions apply to any software derived from or based on the IJG code,
not just to the unmodified library. If you use our work, you ought to
acknowledge us.

Permission is NOT granted for the use of any IJG author's name or company name
in advertising or publicity relating to this software or products derived from
it. This software may be referred to only as "the Independent JPEG Group's
software".

We specifically permit and encourage the use of this software as the basis of
commercial products, provided that all warranty or liability claims are
assumed by the product vendor.


ansi2knr.c is included in this distribution by permission of L. Peter Deutsch,
sole proprietor of its copyright holder, Aladdin Enterprises of Menlo Park, CA.
ansi2knr.c is NOT covered by the above copyright and conditions, but instead
by the usual distribution terms of the Free Software Foundation; principally,
that you must include source code if you redistribute it. (See the file
ansi2knr.c for full details.) However, since ansi2knr.c is not needed as part
of any program generated from the IJG code, this does not limit you more than
the foregoing paragraphs do.

The Unix configuration script "configure" was produced with GNU Autoconf.
It is copyright by the Free Software Foundation but is freely distributable.
The same holds for its supporting scripts (config.guess, config.sub,
ltmain.sh). Another support script, install-sh, is copyright by X Consortium
but is also freely distributable.

The IJG distribution formerly included code to read and write GIF files.
To avoid entanglement with the Unisys LZW patent, GIF reading support has
been removed altogether, and the GIF writer has been simplified to produce
"uncompressed GIFs". This technique does not use the LZW algorithm; the
resulting GIF files are larger than usual, but are readable by all standard
GIF decoders.

We are required to state that
"The Graphics Interchange Format(c) is the Copyright property of
CompuServe Incorporated. GIF(sm) is a Service Mark property of
CompuServe Incorporated."


REFERENCES
==========

We recommend reading one or more of these references before trying to
understand the innards of the JPEG software.

The best short technical introduction to the JPEG compression algorithm is
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.) If you don't have the CACM issue
handy, a PostScript file containing a revised version of Wallace's article is
available at http://www.ijg.org/files/wallace.ps.gz. The file (actually
a preprint for an article that appeared in IEEE Trans. Consumer Electronics)
omits the sample images that appeared in CACM, but it includes corrections
and some added material. Note: the Wallace article is copyright ACM and IEEE,
and it may not be used for commercial purposes.

A somewhat less technical, more leisurely introduction to JPEG can be found in
"The Data Compression Book" by Mark Nelson and Jean-loup Gailly, published by
M&T Books (New York), 2nd ed. 1996, ISBN 1-55851-434-1. This book provides
good explanations and example C code for a multitude of compression methods
including JPEG. It is an excellent source if you are comfortable reading C
code but don't know much about data compression in general. The book's JPEG
sample code is far from industrial-strength, but when you are ready to look
at a full implementation, you've got one here...

The best currently available description of JPEG is the textbook "JPEG Still
Image Data Compression Standard" by William B. Pennebaker and Joan L.
Mitchell, published by Van Nostrand Reinhold, 1993, ISBN 0-442-01272-1.
Price US$59.95, 638 pp. The book includes the complete text of the ISO JPEG
standards (DIS 10918-1 and draft DIS 10918-2).
Although this is by far the most detailed and comprehensive exposition of
JPEG publicly available, we point out that it is still missing an explanation
of the most essential properties and algorithms of the underlying DCT
technology.
If you think that you know about DCT-based JPEG after reading this book,
then you are in delusion. The real fundamentals and corresponding potential
of DCT-based JPEG are not publicly known so far, and that is the reason for
all the mistaken developments taking place in the image coding domain.

The original JPEG standard is divided into two parts, Part 1 being the actual
specification, while Part 2 covers compliance testing methods. Part 1 is
titled "Digital Compression and Coding of Continuous-tone Still Images,
Part 1: Requirements and guidelines" and has document numbers ISO/IEC IS
10918-1, ITU-T T.81. Part 2 is titled "Digital Compression and Coding of
Continuous-tone Still Images, Part 2: Compliance testing" and has document
numbers ISO/IEC IS 10918-2, ITU-T T.83.
IJG JPEG 8 introduces an implementation of the JPEG SmartScale extension
which is specified in a contributed document at ITU and ISO with title "ITU-T
JPEG-Plus Proposal for Extending ITU-T T.81 for Advanced Image Coding", April
2006, Geneva, Switzerland. The latest version of the document is Revision 3.

The JPEG standard does not specify all details of an interchangeable file
format. For the omitted details we follow the "JFIF" conventions, revision
1.02. JFIF 1.02 has been adopted as an Ecma International Technical Report
and thus received a formal publication status. It is available as a free
download in PDF format from
http://www.ecma-international.org/publications/techreports/E-TR-098.htm.
A PostScript version of the JFIF document is available at
http://www.ijg.org/files/jfif.ps.gz. There is also a plain text version at
http://www.ijg.org/files/jfif.txt.gz, but it is missing the figures.

The TIFF 6.0 file format specification can be obtained by FTP from
ftp://ftp.sgi.com/graphics/tiff/TIFF6.ps.gz. The JPEG incorporation scheme
found in the TIFF 6.0 spec of 3-June-92 has a number of serious problems.
IJG does not recommend use of the TIFF 6.0 design (TIFF Compression tag 6).
Instead, we recommend the JPEG design proposed by TIFF Technical Note #2
(Compression tag 7). Copies of this Note can be obtained from
http://www.ijg.org/files/. It is expected that the next revision
of the TIFF spec will replace the 6.0 JPEG design with the Note's design.
Although IJG's own code does not support TIFF/JPEG, the free libtiff library
uses our library to implement TIFF/JPEG per the Note.


ARCHIVE LOCATIONS
=================

The "official" archive site for this software is www.ijg.org.
The most recent released version can always be found there in
directory "files". This particular version will be archived as
http://www.ijg.org/files/jpegsrc.v8c.tar.gz, and in Windows-compatible
"zip" archive format as http://www.ijg.org/files/jpegsr8c.zip.

The JPEG FAQ (Frequently Asked Questions) article is a source of some
general information about JPEG.
It is available on the World Wide Web at http://www.faqs.org/faqs/jpeg-faq/
and other news.answers archive sites, including the official news.answers
archive at rtfm.mit.edu: ftp://rtfm.mit.edu/pub/usenet/news.answers/jpeg-faq/.
If you don't have Web or FTP access, send e-mail to mail-server@rtfm.mit.edu
with body
send usenet/news.answers/jpeg-faq/part1
send usenet/news.answers/jpeg-faq/part2


ACKNOWLEDGMENTS
===============

Thank to Juergen Bruder for providing me with a copy of the common DCT
algorithm article, only to find out that I had come to the same result
in a more direct and comprehensible way with a more generative approach.

Thank to Istvan Sebestyen and Joan L. Mitchell for inviting me to the
ITU JPEG (Study Group 16) meeting in Geneva, Switzerland.

Thank to Thomas Wiegand and Gary Sullivan for inviting me to the
Joint Video Team (MPEG & ITU) meeting in Geneva, Switzerland.

Thank to John Korejwa and Massimo Ballerini for inviting me to
fruitful consultations in Boston, MA and Milan, Italy.

Thank to Hendrik Elstner, Roland Fassauer, Simone Zuck, Guenther
Maier-Gerber, Walter Stoeber, Fred Schmitz, and Norbert Braunagel
for corresponding business development.

Thank to Nico Zschach and Dirk Stelling of the technical support team
at the Digital Images company in Halle for providing me with extra
equipment for configuration tests.

Thank to Richard F. Lyon (then of Foveon Inc.) for fruitful
communication about JPEG configuration in Sigma Photo Pro software.

Thank to Andrew Finkenstadt for hosting the ijg.org site.

Last but not least special thank to Thomas G. Lane for the original
design and development of this singular software package.


FILE FORMAT WARS
================

The ISO JPEG standards committee actually promotes different formats like
"JPEG 2000" or "JPEG XR" which are incompatible with original DCT-based
JPEG and which are based on faulty technologies. IJG therefore does not
and will not support such momentary mistakes (see REFERENCES).
We have little or no sympathy for the promotion of these formats. Indeed,
one of the original reasons for developing this free software was to help
force convergence on common, interoperable format standards for JPEG files.
Don't use an incompatible file format!
(In any case, our decoder will remain capable of reading existing JPEG
image files indefinitely.)


TO DO
=====

Version 8 is the first release of a new generation JPEG standard
to overcome the limitations of the original JPEG specification.
More features are being prepared for coming releases...

Please send bug reports, offers of help, etc. to jpeg-info@uc.ag.