一种三通道、24 位无符号归一化格式，具有 8 位 B 通道，以 sRGB 非线性编码存储在字节 0 中，8 位 G 通道以 sRGB 非线性编码存储在字节 1 中，以及 8 位 R 通道以 sRGB 非线性编码存储在字节 2 中。
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