a new tool to compress jpg files losslessly

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maadjordan
Posts: 25
Joined: Thu Oct 30, 2003 8:33 pm

a new tool to compress jpg files losslessly

Post by maadjordan » Tue Aug 07, 2007 2:45 pm

packJPG v2.2 is released today.

What's new:
- around 40% faster compression & decompression
- major improvements to overall compression (around 2% on average)
- reading from stdin, writing to stdout
- smaller executable
- minor bugfixes
- various minor improvements

Based on tests with various randomly selected images, packJPG reaches compression ratios between those of PAQ8L and PAQ8M.

It is a lot faster than both of them. On average, packJPG needs about 90% less time for compression and decompression of a JPEG file than PAQ8L does and about 93% less than PAQ8M does.

More information about packJPG and contact information can be found here:
http://www.elektronik.htw-aalen.de/packjpg/index.htm

compression ratio is arround 17% and source code to be released soon :-)
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