colour.models.eotf_BT2100_HLG#

colour.models.eotf_BT2100_HLG(E_p: ArrayLike, L_B: float = 0, L_W: float = 1000, gamma: float | None = None, constants: Structure = CONSTANTS_BT2100_HLG, method: Literal['ITU-R BT.2100-1', 'ITU-R BT.2100-2'] | str = 'ITU-R BT.2100-2') → NDArrayFloat[source]#

Define Recommendation ITU-R BT.2100 Reference HLG electro-optical transfer function (EOTF).

The EOTF maps the non-linear HLG signal into display light.

Parameters:

E_p (ArrayLike) – \(E'\) denotes a non-linear colour value \({R', G', B'}\) or \({L', M', S'}\) in HLG space.
L_B (float) – \(L_B\) is the display luminance for black in \(cd/m^2\).
L_W (float) – \(L_W\) is nominal peak luminance of the display in \(cd/m^2\) for achromatic pixels.
gamma (float | None) – System gamma value, 1.2 at the nominal display peak luminance of \(1000 cd/m^2\).
constants (Structure) – Recommendation ITU-R BT.2100 Reference HLG constants.
method (Literal['ITU-R BT.2100-1', 'ITU-R BT.2100-2'] | str) – Computation method.

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_p`	[0, 1]	[0, 1]

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

References

[Bor17], [InternationalTUnion17], [InternationalTUnion18]

Examples

>>> eotf_BT2100_HLG(0.212132034355964)  
6.4760398...
>>> eotf_BT2100_HLG(0.212132034355964, method="ITU-R BT.2100-1")
... 
6.4760398...
>>> eotf_BT2100_HLG(0.212132034355964, 0.01)
... 
7.3321975...

colour.models.eotf_BT2100_HLG#

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