For BC6H encoding in Oodle Texture, we needed a sensible error metric to use in the encoder core. BC6H is HDR which is more challenging than LDR data since we need to handle vast differences in magnitude. BC6H internally essentially treats the float16 bits as 16-bit integers (which is a semi-logarithmic mapping) and works with…

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MRSSE (Mean Relative Sum of Squared Errors) is the error metric used in the BC6H encoder for Oodle Texture to handle HDR data efficiently. The metric, designed to offer better visual results, balances linear system solving with computational efficiency and decent performance on various image tests. It was favored over other error metrics after extensive testing, particularly for its ability to manage highly saturated bright colors better than its closest alternatives.