Here's kodim18 encoded to BC7 mode 6 RDO at 4.84 bpp 40.5 Y PSNR (12.8k endpoints, 12k selectors). Non-RDO BC1 gets 3.2 bpp 35.2 Y PSNR, and non-RDO mode 6 BC7 gets 6.7 bpp 47.5 Y PSNR.pic.twitter.com/OkRiAbP8Az
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BC7’s blind spot are complex blocks with decorrelated alpha. It’ll never handle them particularly well.
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