colour.models.oetf_BT2020

colour.models.oetf_BT2020(E, is_12_bits_system=False)

Defines Recommendation ITU-R BT.2020 opto-electrical transfer function (OETF / OECF).

Parameters:

• E (numeric or array_like) – Voltage \(E\) normalized 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.

Returns:

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

Return type:

numeric or ndarray

References

• [InternationalTUnion15a]

Examples

>>> oetf_BT2020(0.18)  
0.4090077...