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Why not JPEG XR? It supports transparency, lossy and lossless compression, 16 bit channels, color management and has better compression. Is it really just beca
by Aloisius 15y ago
Why not JPEG XR? It supports transparency, lossy and lossless compression, 16 bit channels, color management and has better compression.
Is it really just because it was made by Microsoft?
- ZeroGravitas 15y agoYou mention that it has better compression, which Microsoft certainly claims for it, but can you find any comparison that shows XR as better than standard JPEG when measured with SSIM rather than PSNR? Or subjective human tests[1]? There's quite a few showing it losing to JPEG. Surely they can't all have messed up their testing methodology, though creating and standardising a purpose built photo codec in 2009 that's worse in quality at many common rates than JPEG seems somewhat unbelievable too. 1: "the visual performance of HDPhoto showed notable deficits, both in subjective and objective tests." from Visual Quality Improvement Techniques of HDPhoto/JPEG-XR by T Richter http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=04712398 http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=04712398