Skip to content
Independent JPEG Group's JPEG software
C Shell Makefile Groff CMake SAS Other
Latest commit 6c0fcb8 Nov 2, 2015 @JBarberU JBarberU Bump to version 9.1
Failed to load latest commit information.
cmake Updated cmake macros Aug 20, 2012
.travis.yml Updated travis hook Feb 18, 2013
CMakeLists.txt Add some options to cmake Oct 29, 2015
Makefile.am Bump to version 9.1 Nov 2, 2015
Makefile.in Bump to version 9.1 Nov 2, 2015
README Bump to version 9.1 Nov 2, 2015
aclocal.m4 Bump to version 9.1 Nov 2, 2015
ansi2knr.1 Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
ansi2knr.c Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
cderror.h Imported from jpegsrc.v8.tar.gz. Jan 10, 2010
cdjpeg.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
cdjpeg.h Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
change.log Bump to version 9.1 Nov 2, 2015
cjpeg.1 Bump to version 9.1 Nov 2, 2015
cjpeg.c Bump to version 9.1 Nov 2, 2015
ckconfig.c Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
coderules.txt Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
config.guess Bump to version 9.1 Nov 2, 2015
config.sub Bump to version 9.1 Nov 2, 2015
configure Bump to version 9.1 Nov 2, 2015
configure.ac Bump to version 9.1 Nov 2, 2015
depcomp Bump to version 9.1 Nov 2, 2015
dist.info Bump to version 9.1 Nov 2, 2015
djpeg.1 Bump to version 9.1 Nov 2, 2015
djpeg.c Bump to version 9.1 Nov 2, 2015
example.c Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
filelist.txt Bump to version 9.1 Nov 2, 2015
install-sh Bump to version 9.1 Nov 2, 2015
install.txt Bump to version 9.1 Nov 2, 2015
jaricom.c Imported from jpegsrc.v8d.tar.gz. Jan 15, 2012
jcapimin.c Imported from jpegsrc.v8a.tar.gz. Feb 28, 2010
jcapistd.c Bump to version 9.1 Nov 2, 2015
jcarith.c Bump to version 9.1 Nov 2, 2015
jccoefct.c Imported from jpegsrc.v8d.tar.gz. Jan 15, 2012
jccolor.c Bump to version 9.1 Nov 2, 2015
jcdctmgr.c Bump to version 9.1 Nov 2, 2015
jchuff.c Bump to version 9.1 Nov 2, 2015
jcinit.c Bump to version 9.1 Nov 2, 2015
jcmainct.c Bump to version 9.1 Nov 2, 2015
jcmarker.c Bump to version 9.1 Nov 2, 2015
jcmaster.c Bump to version 9.1 Nov 2, 2015
jcomapi.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
jconfig.bcc Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
jconfig.cfg Bump to version 9.1 Nov 2, 2015
jconfig.dj Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
jconfig.h.cmake Bump to version 9.1 Nov 2, 2015
jconfig.mac Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
jconfig.manx Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
jconfig.mc6 Imported from jpegsrc.v8d.tar.gz. Jan 15, 2012
jconfig.sas Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
jconfig.st Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
jconfig.txt Bump to version 9.1 Nov 2, 2015
jconfig.vc Bump to version 9.1 Nov 2, 2015
jconfig.vms Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
jconfig.wat Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
jcparam.c Bump to version 9.1 Nov 2, 2015
jcprepct.c Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
jcsample.c Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
jctrans.c Bump to version 9.1 Nov 2, 2015
jdapimin.c Bump to version 9.1 Nov 2, 2015
jdapistd.c Bump to version 9.1 Nov 2, 2015
jdarith.c Bump to version 9.1 Nov 2, 2015
jdatadst.c Bump to version 9.1 Nov 2, 2015
jdatasrc.c Imported from jpegsrc.v8d.tar.gz. Jan 15, 2012
jdcoefct.c Imported from jpegsrc.v8d.tar.gz. Jan 15, 2012
jdcolor.c Bump to version 9.1 Nov 2, 2015
jdct.h Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
jddctmgr.c Bump to version 9.1 Nov 2, 2015
jdhuff.c Bump to version 9.1 Nov 2, 2015
jdinput.c Bump to version 9.1 Nov 2, 2015
jdmainct.c Bump to version 9.1 Nov 2, 2015
jdmarker.c Bump to version 9.1 Nov 2, 2015
jdmaster.c Bump to version 9.1 Nov 2, 2015
jdmerge.c Bump to version 9.1 Nov 2, 2015
jdpostct.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
jdsample.c Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
jdtrans.c Imported from jpegsrc.v8.tar.gz. Jan 10, 2010
jerror.c Bump to version 9.1 Nov 2, 2015
jerror.h Bump to version 9.1 Nov 2, 2015
jfdctflt.c Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
jfdctfst.c Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
jfdctint.c Bump to version 9.1 Nov 2, 2015
jidctflt.c Imported from jpegsrc.v8a.tar.gz. Feb 28, 2010
jidctfst.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
jidctint.c Bump to version 9.1 Nov 2, 2015
jinclude.h Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
jmemansi.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
jmemdos.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
jmemdosa.asm Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
jmemmac.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
jmemmgr.c Bump to version 9.1 Nov 2, 2015
jmemname.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
jmemnobs.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
jmemsys.h Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
jmorecfg.h Bump to version 9.1 Nov 2, 2015
jpeg_test.cmake cmake: replace build, update dist.cmake, add tests Apr 13, 2012
jpegint.h Bump to version 9.1 Nov 2, 2015
jpeglib.h Bump to version 9.1 Nov 2, 2015
jpegtran.1 Bump to version 9.1 Nov 2, 2015
jpegtran.c Bump to version 9.1 Nov 2, 2015
jquant1.c Imported from jpegsrc.v8d.tar.gz. Jan 15, 2012
jquant2.c Imported from jpegsrc.v8d.tar.gz. Jan 15, 2012
jutils.c Imported from jpegsrc.v8d.tar.gz. Jan 15, 2012
jversion.h Bump to version 9.1 Nov 2, 2015
libjpeg.map Bump to version 9.1 Nov 2, 2015
libjpeg.txt Bump to version 9.1 Nov 2, 2015
ltmain.sh Imported from jpegsrc.v8d.tar.gz. Jan 15, 2012
makcjpeg.st Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makdjpeg.st Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makeadsw.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makeasln.v10 Imported from jpegsrc.v8b.tar.gz. May 16, 2010
makecdep.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makecdsp.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makecfil.v10 Imported from jpegsrc.v8b.tar.gz. May 16, 2010
makecmak.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makecvcx.v10 Imported from jpegsrc.v8b.tar.gz. May 16, 2010
makeddep.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makeddsp.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makedfil.v10 Imported from jpegsrc.v8b.tar.gz. May 16, 2010
makedmak.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makedvcx.v10 Imported from jpegsrc.v8b.tar.gz. May 16, 2010
makefile.ansi Bump to version 9.1 Nov 2, 2015
makefile.bcc Bump to version 9.1 Nov 2, 2015
makefile.dj Bump to version 9.1 Nov 2, 2015
makefile.manx Bump to version 9.1 Nov 2, 2015
makefile.mc6 Bump to version 9.1 Nov 2, 2015
makefile.mms Bump to version 9.1 Nov 2, 2015
makefile.sas Bump to version 9.1 Nov 2, 2015
makefile.unix Bump to version 9.1 Nov 2, 2015
makefile.vc Bump to version 9.1 Nov 2, 2015
makefile.vms Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makefile.wat Bump to version 9.1 Nov 2, 2015
makejdep.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makejdsp.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makejdsw.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makejfil.v10 Imported from jpegsrc.v8b.tar.gz. May 16, 2010
makejmak.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makejsln.v10 Imported from jpegsrc.v8b.tar.gz. May 16, 2010
makejvcx.v10 Imported from jpegsrc.v8b.tar.gz. May 16, 2010
makeproj.mac Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makerdep.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makerdsp.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makerfil.v10 Imported from jpegsrc.v8b.tar.gz. May 16, 2010
makermak.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makervcx.v10 Imported from jpegsrc.v8b.tar.gz. May 16, 2010
maketdep.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
maketdsp.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
maketfil.v10 Imported from jpegsrc.v8b.tar.gz. May 16, 2010
maketmak.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
maketvcx.v10 Imported from jpegsrc.v8b.tar.gz. May 16, 2010
makewdep.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makewdsp.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makewfil.v10 Imported from jpegsrc.v8b.tar.gz. May 16, 2010
makewmak.vc6 Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makewvcx.v10 Imported from jpegsrc.v8b.tar.gz. May 16, 2010
makljpeg.st Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
maktjpeg.st Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
makvms.opt Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
missing Bump to version 9.1 Nov 2, 2015
rdbmp.c Imported from jpegsrc.v8a.tar.gz. Feb 28, 2010
rdcolmap.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
rdgif.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
rdjpgcom.1 Bump to version 9.1 Nov 2, 2015
rdjpgcom.c Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
rdppm.c Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
rdrle.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
rdswitch.c Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
rdtarga.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
structure.txt Bump to version 9.1 Nov 2, 2015
testimg.bmp Bump to version 9.1 Nov 2, 2015
testimg.jpg Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
testimg.ppm Bump to version 9.1 Nov 2, 2015
testimgp.jpg Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
testorig.jpg Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
testprog.jpg Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
transupp.c Bump to version 9.1 Nov 2, 2015
transupp.h Bump to version 9.1 Nov 2, 2015
usage.txt Bump to version 9.1 Nov 2, 2015
wizard.txt Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
wrbmp.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
wrgif.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
wrjpgcom.1 Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
wrjpgcom.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
wrppm.c Imported from jpegsrc.v7.tar.gz. Jun 27, 2009
wrrle.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998
wrtarga.c Imported from jpegsrc.v6b.tar.gz. Mar 27, 1998

README

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

README for release 9a of 19-Jan-2014
====================================

This distribution contains the ninth 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 ISO/IEC JTC1/SC29/WG1 standards committee
(previously known as JPEG, together with ITU-T SG16).


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) 1991-2014, 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.


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 (now expired), 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 introduced an implementation of the JPEG SmartScale extension
which is specified in two documents:  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 this
document is Revision 3.  And a contributed document ISO/IEC JTC1/SC29/WG1 N
5799 with title "Evolution of JPEG", June/July 2011, Berlin, Germany.
IJG JPEG 9 introduces a reversible color transform for improved lossless
compression which is described in a contributed document ISO/IEC JTC1/SC29/
WG1 N 6080 with title "JPEG 9 Lossless Coding", June/July 2012, Paris,
France.

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.v9a.tar.gz, and in Windows-compatible
"zip" archive format as http://www.ijg.org/files/jpegsr9a.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 Thomas Richter and Daniel Lee for inviting me to the
ISO/IEC JTC1/SC29/WG1 (previously known as JPEG, together with ITU-T SG16)
meeting in Berlin, Germany.

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/IEC JTC1/SC29/WG1 standards committee (previously known as JPEG,
together with ITU-T SG16) currently promotes different formats containing
the name "JPEG" which is misleading because these formats are incompatible
with original DCT-based JPEG and are based on faulty technologies.
IJG therefore does not and will not support such momentary mistakes
(see REFERENCES).
There exist also distributions under the name "OpenJPEG" promoting such
kind of formats which is misleading because they don't support original
JPEG images.
We have no sympathy for the promotion of inferior 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.)

The ISO committee pretends to be "responsible for the popular JPEG" in their
public reports which is not true because they don't respond to actual
requirements for the maintenance of the original JPEG specification.
Furthermore, the ISO committee pretends to "ensure interoperability" with
their standards which is not true because their "standards" support only
application-specific and proprietary use cases and contain mathematically
incorrect code.

There are currently different distributions in circulation containing the
name "libjpeg" which is misleading because they don't have the features and
are incompatible with formats supported by actual IJG libjpeg distributions.
One of those fakes is released by members of the ISO committee and just uses
the name of libjpeg for misdirection of people, similar to the abuse of the
name JPEG as described above, while having nothing in common with actual IJG
libjpeg distributions and containing mathematically incorrect code.
The other one claims to be a "derivative" or "fork" of the original libjpeg,
but violates the license conditions as described under LEGAL ISSUES above
and violates basic C programming properties.
We have no sympathy for the release of misleading, incorrect and illegal
distributions derived from obsolete code bases.
Don't use an obsolete code base!

According to the UCC (Uniform Commercial Code) law, IJG has the lawful and
legal right to foreclose on certain standardization bodies and other
institutions or corporations that knowingly perform substantial and
systematic deceptive acts and practices, fraud, theft, and damaging of the
value of the people of this planet without their knowing, willing and
intentional consent.
The titles, ownership, and rights of these institutions and all their assets
are now duly secured and held in trust for the free people of this planet.
People of the planet, on every country, may have a financial interest in
the assets of these former principals, agents, and beneficiaries of the
foreclosed institutions and corporations.
IJG asserts what is: that each man, woman, and child has unalienable value
and rights granted and deposited in them by the Creator and not any one of
the people is subordinate to any artificial principality, corporate fiction
or the special interest of another without their appropriate knowing,
willing and intentional consent made by contract or accommodation agreement.
IJG expresses that which already was.
The people have already determined and demanded that public administration
entities, national governments, and their supporting judicial systems must
be fully transparent, accountable, and liable.
IJG has secured the value for all concerned free people of the planet.

A partial list of foreclosed institutions and corporations ("Hall of Shame")
is currently prepared and will be published later.


TO DO
=====

Version 9 is the second release of a new generation JPEG standard
to overcome the limitations of the original JPEG specification,
and is the first true source reference JPEG codec.
More features are being prepared for coming releases...

Please send bug reports, offers of help, etc. to jpeg-info@jpegclub.org.
Something went wrong with that request. Please try again.