colour.models.ootf_HLG_BT2100¶
-
colour.models.
ootf_HLG_BT2100
(E, L_B=0, L_W=1000, gamma=None, method='ITU-R BT.2100-2')[source]¶ Defines Recommendation ITU-R BT.2100 Reference HLG opto-optical transfer function (OOTF / OOCF).
The OOTF maps relative scene linear light to display linear light.
- Parameters
E (numeric or array_like) – \(E\) is the signal for each colour component \({R_S, G_S, B_S}\) proportional to scene linear light and scaled by camera exposure.
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 \(1000 cd/m^2\).
method (unicode, optional) – {‘ITU-R BT.2100-1’, ‘ITU-R BT.2100-2’}, Computation method.
- Returns
\(F_D\) is the luminance of a displayed linear component \({R_D, G_D, or B_D}\), in \(cd/m^2\).
- Return type
numeric or ndarray
Notes
Domain
Scale - Reference
Scale - 1
E
[0, 1]
[0, 1]
Range
Scale - Reference
Scale - 1
F_D
[0, 1]
[0, 1]
References
[Bor17], [InternationalTUnion17]
Examples
>>> ootf_HLG_BT2100(0.1) 63.0957344... >>> ootf_HLG_BT2100(0.1, 0.01, method='ITU-R BT.2100-1') ... 63.1051034...