[Openexr-devel] JPEG-HDR/JPEG 2000/JPEG-XR on OpenEXR images ready

[Thomas Richter]

Hi folks,

in case you're interested, I completed the study of floating-point compression 
algorithms on the OpenEXR image set, comparing the
compression performance of JPEG-HDR with that of the floating-point JPEG-XR 
compression and a JPEG 2000 based floating point
compression format. Anyone interested in a pre-print might simply sent me a 
note.

Short results for the impatient: In almost all cases, JPEG 2000 performs best 
here. There is one interesting corner case, namely
the OpenEXR "StillLife" image where JPEG-HDR outperforms all other compression 
schemes, which is due to the extreme nature of the
image - here JPEG-HDR profits from its adaptive tone-mapper. JPEG 2000/JPEG-XR 
use a fixed mapping from floating point to integer,
offering the advantage of making lossless compression of floats possible.

So long,
        Thomas