colour.models.ootf_HLG_BT2100¶
- colour.models.ootf_HLG_BT2100(E: FloatingOrArrayLike, L_B: Floating = 0, L_W: Floating = 1000, gamma: Optional[Floating] = None, 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 opto-optical transfer function (OOTF / OOCF).
The OOTF maps relative scene linear light to display linear light.
- Parameters
E (FloatingOrArrayLike) – \(E\) 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 (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 \(1000 cd/m^2\).
method (Union[Literal[('ITU-R BT.2100-1', 'ITU-R BT.2100-2')], str]) – 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
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...