colour.ootf_inverse

colour.ootf_inverse(value, function='ITU-R BT.2100 PQ', **kwargs)[source]

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

Parameters
  • value (numeric or array_like) – Value.

  • function (str, optional) – {‘ITU-R BT.2100 HLG’, ‘ITU-R BT.2100 PQ’} Inverse opto-optical transfer function (OOTF / OOCF).

  • L_B (numeric, optional) – {colour.models.ootf_inverse_HLG_BT2100()}, \(L_B\) is the display luminance for black in \(cd/m^2\).

  • L_W (numeric, optional) – {colour.models.ootf_inverse_HLG_BT2100()}, \(L_W\) is nominal peak luminance of the display in \(cd/m^2\) for achromatic pixels.

  • gamma (numeric, optional) – {colour.models.ootf_inverse_HLG_BT2100()}, System gamma value, 1.2 at the nominal display peak luminance of \(1000 cd/m^2\).

Returns

Luminance of scene linear light.

Return type

numeric or ndarray

Examples

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