colour.models.oetf_inverse_HLG_BT2100

colour.models.oetf_inverse_HLG_BT2100(E_p, constants={'a': 0.17883277, 'b': 0.28466892, 'c': 0.559910729529562})[source]

Defines Recommendation ITU-R BT.2100 Reference HLG inverse opto-electrical transfer function (OETF / OECF).

Parameters:
  • E_p (numeric or array_like) – \(E'\) is the resulting non-linear signal \({R', G', B'}\).
  • constants (Structure, optional) – Recommendation ITU-R BT.2100 Reference HLG constants.
Returns:

\(E\) is the signal for each colour component \({R_S, G_S, B_S}\) proportional to scene linear light and scaled by camera exposure.

Return type:

numeric or ndarray

Notes

Domain Scale - Reference Scale - 1
E_p [0, 1] [0, 1]
Range Scale - Reference Scale - 1
E [0, 1] [0, 1]

References

[Borer2017a], [InternationalTelecommunicationUnion2017]

Examples

>>> oetf_inverse_HLG_BT2100(0.212132034355964)  # doctest: +ELLIPSIS
0.0149999...