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

[thorfdbg]

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