colour.models.eotf_BT2100_HLG¶
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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...