That's right, it's another texture compression blog post! I'll keep it short. By "solid-color block", I mean a 4x4 block of pixels that all have the same color. ASTC has a dedicated encoding for these ("void-extent blocks"), BC7 does not. Therefore we have an 8-bit RGBA input color and want to figure out how to…

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This post explains the optimal encoding of 4×4 blocks of solid colors in BC7 texture compression. Unlike BC1, BC7 allows precise color matches due to its encoding options. The author provides a method to determine optimal color endpoints, ensuring accurate representation of 8-bit RGBA input colors using BC7 mode 5's interpolation formula.

BC7 optimal solid-color blocks