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证明 YUV 4:2:0 方案每像素的等效位数为 12
YUV 4:2:0 中存储 4 个像素的位数为:
4*8+8+8=48 bits
即亮度为 4 个字节,每个颜色平面为 1 个字节
这给出了平均值
48/4=12bpp