https://docs.amd.com/r/en-US/pg103-v-tpg/Mask-ID?contentId=IdN2jf_4tdzisLxLijDcXA
Mask ID - Mask ID - 8.2 English - PG103
The Mask ID register only takes effect on RGB video format. It controls mask-out of a particular color component. 0x0 - No masking 0x1 - Mask out the red...
maskidenglish