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I have a file which contains raw pixel data and I want to compress this data using JPEG lossless compression. I tried to search for this tool using google but couldn't fina any. Does anybody know here of any tool which takes raw data as input and compresses it using JPEG lossless format?

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Which operating system? – Richard Sep 5 '09 at 11:02
By 'raw pixel data', do you mean a camera RAW format? Also, do you specifically mean JPEG-LS format (en.wikipedia.org/wiki/Lossless_JPEG) or will lossless JPEG 2000 (en.wikipedia.org/wiki/Lossless_JPEG) do? – pelms Sep 5 '09 at 13:26
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XnView, view/convert over 400 graphic file formats (incl. various RAW standards)

a portable version is also available.

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+1, XnView seems to support JPEG-LS (jls) file export. Should be checked out. – nik Sep 5 '09 at 12:53
From the XnView features page: Export about 50 graphic file formats which includes jls and JPEG 2000. – nik Sep 5 '09 at 12:55
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I find irfanview from http://irfanview.net faster than xnview

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These are starter pointers for Lossless JPEG compression,

Is there a specific reason for targetting lossless JPEG?
Would the RAW and other lossless formats not work?

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REA Converter can convert RAW images to various formats, and have a lite edition that is free. THere is also the Contenta RAW Convert however it is not free.

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