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Thread: JPEG announces availablility of CD Text for JPEG XT lossless and alpha

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    JPEG announces availablility of CD Text for JPEG XT lossless and alpha

    Hi folks,

    just some news flash from the latest JPEG meeting here in Sydney. We're proud to announce that the CD text (committee draft) of JPEG XT parts 8 and 9 became available today.

    JPEG XT is a whole backward compatible extension to the well-known JPEG compression standard for full images, that is, all images compressed in this form will be reconstructable by any legacy JPEG decoder.

    Part 8 is a lossless extension for JPEG, for bit depths of 8 and beyond, including floating point. A legacy decoder will of course only reconstruct a lossy 8-bit version of the image, but a XT-8 decoder is able to reconstruct to full quality and full bitdepth.

    Part 9 adds the long-missing support for alpha channels in JPEG. It allows you to compress the opacity information with or without loss, at bit depth of 8 or beyond.

    A reference implementation of part-8 (still pending changes due to some last-minute requests) can be found on our website at http://www.jpeg.org

    The implementation will be updated in the near future to support part-9. I especially want to thank members of the community for helping to define, review and update the CD text, this was a nice experience I would prefer to repeat in the future.

    In case you want to subscribe to JPEG news, please go to https://listserv.uni-stuttgart.de/ma...info/jpeg-news
    This is a hassle-free, read-only reflector for our activities.

    For JPEG internal discussion on JPEG XT, the committee opened its internal mail reflectors for external participation last meeting. You can subscribe at:
    https://listserv.uni-stuttgart.de/ma...peg-extensions

    For the latter, please allow a one-week (at most) review process, were you will be asked on your motivation and background. That's only to keep spammers out of our process.

    Thanks a lot and greetings,

    Thomas

  2. Thanks (3):

    Jaff (10th February 2015),Matt Mahoney (7th February 2015),nikkho (6th February 2015)

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