colour.models.ootf_BT2100_HLG#

colour.models.ootf_BT2100_HLG(E: Domain1, L_B: float = 0, L_W: float = 1000, gamma: float | None = None, method: Literal['ITU-R BT.2100-1', 'ITU-R BT.2100-2'] | str = 'ITU-R BT.2100-2') → Range1[source]#

Apply the Recommendation ITU-R BT.2100 Reference HLG opto-optical transfer function (OOTF).

The OOTF maps relative scene linear light to display linear light.

Parameters:

E (Domain1) – \(E = \{R_S, G_S, B_S; Y_S; \text{or } I_S\}\) denotes the signal determined by scene light and scaled by camera exposure.
L_B (float) – Display luminance for black \(L_B\) in \(cd/m^2\).
L_W (float) – Nominal peak luminance \(L_W\) of the display in \(cd/m^2\) for achromatic pixels.
gamma (float | None) – System gamma value, defaults to 1.2 at the nominal display peak luminance of \(1000 cd/m^2\).
method (Literal['ITU-R BT.2100-1', 'ITU-R BT.2100-2'] | str)

Returns:

Luminance \(F_D\) of a displayed linear component \(\{R_D, G_D, B_D\}\) or \(Y_D\) or \(I_D\), in \(cd/m^2\).

Return type:

numpy.ndarray

Notes

Domain	Scale - Reference	Scale - 1
`E`	1	1

Range	Scale - Reference	Scale - 1
`F_D`	1	1

References

[Bor17], [InternationalTUnion17]

Examples

>>> ootf_BT2100_HLG(0.1)
63.0957344...
>>> ootf_BT2100_HLG(0.1, 0.01, method="ITU-R BT.2100-1")
...
63.1051034...

colour.models.ootf_BT2100_HLG#

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