Independent JPEG Group

Development Site


JPEG 25th anniversary conference


The Independent JPEG Group (IJG) is responsible for the reference implementation of the original JPEG standard. The reference software from the Independent JPEG Group was a key to the success of the original JPEG standard and has found widespread adoption in applications of image coding. Particularly, all contemporary digital photo cameras support the capture of images in JPEG format as the common medium for image interchange, and all image viewers, image editors, and Web browsers can display JPEG images as common standard.


The IJG implementation was first publicly released in October 1991 and has been considerably developed since that time.


In June 2009, Independent JPEG Group published a new major release (version 7) of the software package to enable a new set of features for image coding application and therewith to continue the success story of JPEG.


In January 2010, Independent JPEG Group introduced a new release (version 8) with extensions providing the fundament for the next generation image coding standard.


In January 2013, Independent JPEG Group released version 9 with improvements for the new introduced lossless coding mode.


Version 9c is currently in development and is planned for release in January 2018.


Note: Published development versions are intended to provide stable functionality, but may not be complete regarding the documentation, and further features may be planned for the release. You are encouraged to use these versions if you need the new functions (see below).

Filename Size Last modified Type
jpegsr9b.zip 1.065 KB  17 Jan 2016 Zip Compressed Data
jpegsrc.v9b.tar.gz 999 KB  17 Jan 2016 Unix Tape Archive

Preliminary version 9c, intended for release in January 2018:


Filename Size Last modified Type
jpegsr09c.zip 1.069 KB  26 Apr 2017 Zip Compressed Data
jpegsrc.v09c.tar.gz 1.003 KB  26 Apr 2017 Unix Tape Archive

CHANGE LOG for Independent JPEG Group's JPEG software


Version 9c 14-Jan-2018


Make range extension bits adjustable (in jpegint.h).
Thank to Robin Watts for suggestion.


Provide macros for fflush() and ferror() in jinclude.h in order
to facilitate adaption by applications using an own FILE class.
Thank to Gerhard Huber for suggestion.


Add bound checks for rescale array index in the PPM reader module (rdppm.c).


Version 9b 17-Jan-2016


Improvements and optimizations in DCT and color calculations.
Normalize range limit array composition and access pattern.
Thank to Sia Furler and Maddie Ziegler for inspiration.


Use merged upsample with scaled DCT sizes larger than 8.
Thank to Taylor Hatala for inspiration.


Check for excessive comment lengths in argument parsing in wrjpgcom.c.
Thank to Julian Cohen for hint.


Add makefile.b32 for use with Borland C++ 32-bit (bcc32).
Thank to Joe Slater for contribution.


Document 'f' specifier for jpegtran -crop specification.
Thank to Michele Martone for suggestion.


Use defined value from header instead of hardwired number in rdswitch.c.
Thank to Robert Sprowson for hint.


 
Zu dieser Seite gibt es 6 Dateien. [Zeige Dateien/Upload]
Kommentare [Verberge Kommentare]

Information

Letzte Änderung: 2017-04-29 15:12:29 von Guido Vollbeding