colour.models.eotf_HLG_BT2100¶
- colour.models.eotf_HLG_BT2100(E_p: FloatingOrArrayLike, L_B: Floating = 0, L_W: Floating = 1000, gamma: Optional[Floating] = None, constants: Structure = CONSTANTS_BT2100_HLG, method: Union[Literal['ITU-R BT.2100-1', 'ITU-R BT.2100-2'], str] = 'ITU-R BT.2100-2') FloatingOrNDArray[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 (FloatingOrArrayLike) – \(E'\) denotes a non-linear colour value \({R', G', B'}\) or \({L', M', S'}\) in HLG space.
L_B (Floating) – \(L_B\) is the display luminance for black in \(cd/m^2\).
L_W (Floating) – \(L_W\) is nominal peak luminance of the display in \(cd/m^2\) for achromatic pixels.
gamma (Optional[Floating]) – 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 (Union[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
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_HLG_BT2100(0.212132034355964) 6.4760398... >>> eotf_HLG_BT2100(0.212132034355964, method='ITU-R BT.2100-1') ... 6.4760398... >>> eotf_HLG_BT2100(0.212132034355964, 0.01) ... 7.3321975...