本标准扩展了Y'C'₁C₂（A） SMPTE ST 2073-3中定义的图像格式，包括二次采样色差分量（包括4:2:2、4:2:0、4:1:1和4:1:0）。alpha通道是可选的，可以与Y'通道具有相同的分辨率，也可以与C'通道具有相同的分辨率₁ C'₂ 频道。本标准添加了AlphaSampling参数，以指定是否对alpha分量进行二次采样。对色差分量重新采样的操作超出范围。

This standard extends the Y'C'₁C₂(A) image format defined in SMPTE ST 2073-3 to include subsampled color difference components (including 4:2:2, 4:2:0, 4:1:1, and 4:1:0). An alpha channel is optional and can have the same resolution as the Y' channel or the same resolution as the C'₁ and C'₂ channels.This standard adds the AlphaSampling parameter to specify whether the alpha component is subsampled.Operations that resample color difference components are out of scope.