ST 2073-4:2015 - SMPTE Standard - VC-5 Video Essence — Part 4: Subsampled Color Difference Components

This standard extends the Y′C′
1
C′
2
(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.