colour.models.eotf_BT2100_HLG

colour.models.eotf_BT2100_HLG(E_p, L_B=0, L_W=1000, gamma=None)[source]

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

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

Parameters:
  • E_p (numeric or array_like) – \(E'\) denotes a non-linear colour value \({R', G', B'}\) or \({L', M', S'}\) in HLG space.
  • L_B (numeric, optional) – \(L_B\) is the display luminance for black in \(cd/m^2\).
  • L_W (numeric, optional) – \(L_W\) is nominal peak luminance of the display in \(cd/m^2\) for achromatic pixels.
  • gamma (numeric, optional) – System gamma value, 1.2 at the nominal display peak luminance of \(1000 cd/m^2\).
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:

numeric or 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], [InternationalTUnion16]

Examples

>>> eotf_BT2100_HLG(0.212132034355964)  # doctest: +ELLIPSIS
6.4760398...