[pixelesque]

Years ago you used to be able to open .r3d files after hex editing the magic header numbers with a generic jpeg2000 codec, but that's no longer the case with more modern variations of the file format (they encrypt it), but obviously the core image compression is still fairly similar (wavelets), but it's not like you got high-quality YCrCb data out of the .r3d file that way anyway (as you would if it was a true jpeg2000 file), you'd need to de-bayer it first (hence the two green channels you get, which effectively give it twice the resolution for green - somewhat similar to Chroma encoding like 422).