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The Independent JPEG Group's JPEG software
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- README for release 8c of 16 -Jan-2011
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+ README for release 8d of 15 -Jan-2012
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====================================
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This distribution contains the eighth public release of the Independent JPEG
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Julian Minguillon, Luis Ortiz, George Phillips, Davide Rossi, Ge' Weijers,
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and other members of the Independent JPEG Group.
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- IJG is not affiliated with the official ISO JPEG standards committee.
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+ IJG is not affiliated with the ISO/IEC JTC1/SC29/WG1 standards committee
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+ (also known as JPEG, together with ITU-T SG16).
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DOCUMENTATION ROADMAP
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fitness for a particular purpose. This software is provided "AS IS", and you,
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its user, assume the entire risk as to its quality and accuracy.
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- This software is copyright (C) 1991-2011 , Thomas G. Lane, Guido Vollbeding.
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+ This software is copyright (C) 1991-2012 , Thomas G. Lane, Guido Vollbeding.
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All Rights Reserved except as specified below.
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Permission is hereby granted to use, copy, modify, and distribute this
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Continuous-tone Still Images, Part 2: Compliance testing" and has document
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numbers ISO/IEC IS 10918-2, ITU-T T.83.
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IJG JPEG 8 introduces an implementation of the JPEG SmartScale extension
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- which is specified in a contributed document at ITU and ISO with title "ITU-T
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- JPEG-Plus Proposal for Extending ITU-T T.81 for Advanced Image Coding", April
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- 2006, Geneva, Switzerland. The latest version of the document is Revision 3.
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+ which is specified in two documents: A contributed document at ITU and ISO
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+ with title "ITU-T JPEG-Plus Proposal for Extending ITU-T T.81 for Advanced
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+ Image Coding", April 2006, Geneva, Switzerland. The latest version of this
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+ document is Revision 3. And a contributed document ISO/IEC JTC1/SC29/WG1 N
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+ 5799 with title "Evolution of JPEG", June/July 2011, Berlin, Germany.
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The JPEG standard does not specify all details of an interchangeable file
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format. For the omitted details we follow the "JFIF" conventions, revision
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The "official" archive site for this software is www.ijg.org.
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The most recent released version can always be found there in
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directory "files". This particular version will be archived as
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- http://www.ijg.org/files/jpegsrc.v8c .tar.gz, and in Windows-compatible
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- "zip" archive format as http://www.ijg.org/files/jpegsr8c .zip.
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+ http://www.ijg.org/files/jpegsrc.v8d .tar.gz, and in Windows-compatible
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+ "zip" archive format as http://www.ijg.org/files/jpegsr8d .zip.
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The JPEG FAQ (Frequently Asked Questions) article is a source of some
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general information about JPEG.
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Thank to Thomas Wiegand and Gary Sullivan for inviting me to the
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Joint Video Team (MPEG & ITU) meeting in Geneva, Switzerland.
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+ Thank to Thomas Richter and Daniel Lee for inviting me to the
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+ ISO/IEC JTC1/SC29/WG1 (also known as JPEG, together with ITU-T SG16)
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+ meeting in Berlin, Germany.
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+
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Thank to John Korejwa and Massimo Ballerini for inviting me to
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fruitful consultations in Boston, MA and Milan, Italy.
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@@ -304,17 +311,35 @@ design and development of this singular software package.
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FILE FORMAT WARS
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================
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- The ISO JPEG standards committee actually promotes different formats like
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- "JPEG 2000" or "JPEG XR" which are incompatible with original DCT-based
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- JPEG and which are based on faulty technologies. IJG therefore does not
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- and will not support such momentary mistakes (see REFERENCES).
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- We have little or no sympathy for the promotion of these formats. Indeed,
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- one of the original reasons for developing this free software was to help
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- force convergence on common, interoperable format standards for JPEG files.
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+ The ISO/IEC JTC1/SC29/WG1 standards committee (also known as JPEG, together
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+ with ITU-T SG16) currently promotes different formats containing the name
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+ "JPEG" which is misleading because these formats are incompatible with
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+ original DCT-based JPEG and are based on faulty technologies.
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+ IJG therefore does not and will not support such momentary mistakes
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+ (see REFERENCES).
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+ There exist also distributions under the name "OpenJPEG" promoting such
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+ kind of formats which is misleading because they don't support original
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+ JPEG images.
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+ We have no sympathy for the promotion of inferior formats. Indeed, one of
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+ the original reasons for developing this free software was to help force
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+ convergence on common, interoperable format standards for JPEG files.
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Don't use an incompatible file format!
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(In any case, our decoder will remain capable of reading existing JPEG
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image files indefinitely.)
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+ Furthermore, the ISO committee pretends to be "responsible for the popular
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+ JPEG" in their public reports which is not true because they don't respond to
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+ actual requirements for the maintenance of the original JPEG specification.
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+
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+ There are currently distributions in circulation containing the name
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+ "libjpeg" which claim to be a "derivative" or "fork" of the original
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+ libjpeg, but don't have the features and are incompatible with formats
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+ supported by actual IJG libjpeg distributions. Furthermore, they
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+ violate the license conditions as described under LEGAL ISSUES above.
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+ We have no sympathy for the release of misleading and illegal
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+ distributions derived from obsolete code bases.
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+ Don't use an obsolete code base!
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+
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TO DO
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=====
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to overcome the limitations of the original JPEG specification.
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More features are being prepared for coming releases...
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- Please send bug reports, offers of help, etc. to jpeg-info@uc.ag .
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+ Please send bug reports, offers of help, etc. to jpeg-info@jpegclub.org .
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