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Libjpeg 9 Does Better Lossless JPEG Compression

Free Software

Published on 14 January 2013 10:00 AM EST
Written by Michael Larabel in Free Software
12 Comments

Version 9 of the libjpeg library from the Independent JPEG Group has been released. This version of the JPEG library is said to noticeably improve the lossless JPEG compression support even to the point that libjpeg can now output compressed lossless JPEGs of smaller size than PNG images.

The new lossless coding mode for libjpeg 9 is unfortunately not backwards compatible with earlier releases of this JPEG library. The compression abilities are increased significantly with IJG's libjpeg 9 but with included color transform, the compressed JPEGs from this library will break with older JPEG decoders.

The version nine release notes state about this new support, "Add cjpeg -rgb1 option to create an RGB JPEG file, and insert a simple reversible color transform into the processing which significantly improves the compression. The recommended command for lossless coding of RGB images is now cjpeg -rgb1 -block 1 -arithmetic."

Aside from the significant compression improvements, there's also other changes and enhancements to this widely-used compression library as noted at Infai.org.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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