Here's kodim14 compressed to RDO BC7 (mode 6) at 4.74 bpp 40.0 Y PSNR (12k endpoints/12k selectors). Non-RDO BC1 gets 2.98 bpp 35.5 Y PSNR, and non-RDO BC7 (mode 6) gets 6.56 bpp 46.28 Y PSNR. (The lossless codec is LZMA.)pic.twitter.com/VTSu268Rvh
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After shipping this, the next logical step is to add mode 1 support for complex opaque blocks. After that, it's unclear - modes 4 and 7?