please add support for packJPG image format packJPG losslessly compresses JPEG and achieves 20 - 40% filesize reduction. Original JPEG can be unpacked and the output is bitwise identical to original. Image viewers like XnView can display packJPG compressed files directly so manual decoding step is not needed. packJPG is free, open and might help reducing LibreOffice documents with many JPEG inside. The project website is here: http://www.elektronik.htw-aalen.de/packjpg/ You can find the latest version and sources here: http://www.matthiasstirner.com/
valuable enhancement request. set status to NEW.
Thanks, I didn't know about packJPG. However, I don't think we can use it because if we "pack" a jpeg file in the document then other programs (OpenOffice, Calligra, MS Office for example) that don't support packJPG (and probably never will) won't be able to show it.
Would it make a change if packJPG would be included in a future ODF specification?
Yes, it would, but the ODF specification does not mandate which graphic formats must be supported (it only says PNG for raster and SVG for vector should be supported) so JPEG is not even mentioned in the specification.
Also, Lepton could be supported as image format. It contains losslessly compressed JPEG (like packJPG). The project can be found here: https://github.com/dropbox/lepton
Since 2014, the position on this became clearer as evidenced by Tomaž's essay in bug 114533. Closing as WONTFIX.