jpark37 338608bd67 libobs,UI: Support HLG nominal peak level
HLG output uses MovieLabs-recommended procedure.

- If peak luminance is greater than 1000, use maxRGB EETF to 1000.
- Otherwise, don't tonemap.
- Then use normal HLG conversion procedure with gamma 1.2 (1000 nits).
2022-04-14 09:36:44 -07:00
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