colour.models.oetf_HLG_BT2100¶

colour.models.oetf_HLG_BT2100(E, constants={'a': 0.17883277, 'b': 0.28466892, 'c': 0.559910729529562})[source]¶

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

The OETF maps relative scene linear light into the non-linear HLG signal value.

Parameters

E (numeric or array_like) – \(E\) is the signal for each colour component \({R_S, G_S, B_S}\) proportional to scene linear light and scaled by camera exposure.
constants (Structure, optional) – Recommendation ITU-R BT.2100 Reference HLG constants.

Returns

\(E'\) is the resulting non-linear signal \({R', G', B'}\).

Return type

numeric or ndarray

Notes

Domain	Scale - Reference	Scale - 1
`E`	[0, 1]	[0, 1]

Range	Scale - Reference	Scale - 1
`E_p`	[0, 1]	[0, 1]

References

Examples

>>> oetf_HLG_BT2100(0.18 / 12)  
0.2121320...