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Lossless Float Image Compression
Back in 2021 I looked at OpenEXR lossless compression options (and I think my findings led a change of the default zip compression level, as well as change of the compression library from zlib to libdeflate. Yay blogging about things!).
There does not seem to be a readily available “standard image set” like that to test things on, so I grabbed some that I could find, and some I have rendered myself out of various Blender splash screen files. There’s a recent “ The JPEG XL Image Coding System ” paper on arXiv with many details and impressive results, and the reference open source implementation is libjxl. At least right now, ffmpeg EXR code is their own custom implementation, that is completely single threaded and lacks some other optimizations that official OpenEXR library does.
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