colour.models.oetf_BT2020

colour.models.oetf_BT2020(E: ArrayLike, is_12_bits_system: bool = False, constants: Structure = CONSTANTS_BT2020) → NDArrayFloat

Define Recommendation ITU-R BT.2020 opto-electronic transfer function (OETF).

Parameters:

• E (ArrayLike) – Voltage \(E\) normalised by the reference white level and proportional to the implicit light intensity that would be detected with a reference camera colour channel R, G, B.

• is_12_bits_system (bool) – BT.709 alpha and beta constants are used if system is not 12-bit.

• constants (Structure) – Recommendation ITU-R BT.2020 constants.

Returns:

Resulting non-linear signal \(E'\).

Return type:

numpy.ndarray

Notes

Domain	Scale - Reference	Scale - 1
E	[0, 1]	[0, 1]

Range	Scale - Reference	Scale - 1
E_p	[0, 1]	[0, 1]

References

[InternationalTUnion15a]

Examples

>>> oetf_BT2020(0.18)  
0.4090077...