Welcome to the packJPG Homepage
Note (Nov 20, 2014):The most recent versions of packJPG and packARC are available from the authors website
(always up-to-date): http://www.matthiasstirner.com/ or http://packjpg.encode.ru/
Recenty added (Feb 26, 2013): V2.5f
packJPG v2.5e now released under the LGPL.
It is now open source under the terms of LGPL v3 (previous licensing was GPL v3).
Improvements over packJPG v2.5a (last public version):
Versions 2.5a of packJPG and 2.5e are meant to be fully compatible.
W A R N I N G !!! (12-03-30)
This version 2.5a is compatible with version 2.5.
The changes between version 2.5 and 2.5a are meant to improve
the build process in particular using g++ version 4 and under Linux.
Download the improved package here!
Latest Binary Releases of packJPG: V2.5
packJPG 2.5 is now open source and available for download.
Lossless Compression for PNM-Image Files:
- packPNM is a state-of-the-art lossless compression software for PNM (PPM/PGM/PBM) images.
It is more or less an experiment wether parts of the packJPG algorithm could be reused for different, non DCT based image types as well. packPNMs compression ratios are varying, but are typically quite good in comparison to other approaches, especially for binary (PBM) images.
We release packPNM and its source code (to be used under the terms of the GPL v3) alongside packJPG v2.5.
Download packPNM 1.0e Source Code incl. Windows Executable!
JPEG Open Source Developers Package:
- We also release the "JPEG Open Source Developers Package v1.0e".
The package includes several of the tools used in analysing JPEG data and developing packJPG.
Please note: The packJPG source code is not included in this package.
Download the JPEG Open Source Developers Package from here!
Notes and Papers:
There's also an official GUI for packJPG 2.4 under Microsoft Windows,
see Michael Lees "packJPG options" on his website
- The packJPG approach used in version 2.0 was presented on the
Picture Coding Symposium 2007 in Lisboa: Paper, describing the implemented algorithms:
Improved redundancy reduction for jpeg files.