colour.models.oetf_BT2020#

colour.models.oetf_BT2020(E: ArrayLike, is_12_bits_system: bool = False, constants: Structure = CONSTANTS_BT2020) NDArrayFloat[source]#

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...