colour.ootf_inverse#

colour.ootf_inverse(value: Union[float, _SupportsArray[dtype], _NestedSequence[_SupportsArray[dtype]], bool, int, complex, str, bytes, _NestedSequence[Union[bool, int, float, complex, str, bytes]]], function: Union[Literal['ITU-R BT.2100 HLG', 'ITU-R BT.2100 PQ'], str] = 'ITU-R BT.2100 PQ', **kwargs: Any) → Union[float, ndarray][source]#

Map relative display linear light to scene linear light using given inverse opto-optical transfer function (OOTF / OOCF).

Parameters:

value (Union[float, _SupportsArray[dtype], _NestedSequence[_SupportsArray[dtype]], bool, int, complex, str, bytes, _NestedSequence[Union[bool, int, float, complex, str, bytes]]]) – Value.
function (Union[Literal['ITU-R BT.2100 HLG', 'ITU-R BT.2100 PQ'], str]) – Inverse opto-optical transfer function (OOTF / OOCF).
kwargs (Any) – {colour.models.ootf_inverse_BT2100_HLG(), colour.models.ootf_inverse_BT2100_PQ()}, See the documentation of the previously listed definitions.

Returns:

Luminance of scene linear light.

Return type:

numpy.floating or numpy.ndarray

Examples

>>> ootf_inverse(779.988360834115840)  
0.1000000...
>>> ootf_inverse(  
...     63.095734448019336, function='ITU-R BT.2100 HLG')
0.1000000...