colour.models.eotf_inverse_BT2020

colour.models.eotf_inverse_BT2020(E: FloatingOrArrayLike, is_12_bits_system: bool = False, constants: colour.utilities.data_structures.Structure = CONSTANTS_BT2020) → FloatingOrNDArray[source]

Define Recommendation ITU-R BT.2020 inverse electro-optical transfer function (EOTF).

Parameters

  • E (FloatingOrArrayLike) – 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 (colour.utilities.data_structures.Structure) – Recommendation ITU-R BT.2020 constants.

Returns

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

Return type

numpy.floating or 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

>>> eotf_inverse_BT2020(0.18)  
0.4090077...

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