Backport of "d3d11converter: Fix RGB to GRAY conversion" into 1.20
Backport of !1697 (merged) "d3d11converter: Fix RGB to GRAY conversion".
Commits:
- e3e23a2c d3d11converter: Fix RGB to GRAY conversion
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Backport of !1697 (merged) "d3d11converter: Fix RGB to GRAY conversion".
Commits: