Expand description
This protocol extension delivers the metadata required to define alpha mode, the color model, sub-sampling and quantization range used when interpreting buffer contents. The main use case is defining how the YCbCr family of pixel formats convert to RGB.
Note that this protocol does not define the colorimetry of the resulting RGB channels / tristimulus values. Without the help of other extensions the resulting colorimetry is therefore implementation defined.
If this extension is not used, the color representation used is compositor implementation defined.
Recommendation ITU-T H.273 “Coding-independent code points for video signal type identification” shall be referred to as simply H.273 here.