There is already a built-in CURVE - LINEAR_to_ST-2084 transform, but no HLG curve exists. Only DISPLAY - CIE-XYZ-D65_to_REC.2100-HLG-1000nit which, being display-referred cannot be used for scene light conversions to and from HLG. As per #1968, this curve should be mirrored about zero.
There is already a built-in
CURVE - LINEAR_to_ST-2084transform, but no HLG curve exists. OnlyDISPLAY - CIE-XYZ-D65_to_REC.2100-HLG-1000nitwhich, being display-referred cannot be used for scene light conversions to and from HLG. As per #1968, this curve should be mirrored about zero.