colour.models.oetf_BT2020¶
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colour.models.
oetf_BT2020
(E, is_12_bits_system=False, constants={'alpha': <function <lambda>>, 'beta': <function <lambda>>})[source]¶ Defines Recommendation ITU-R BT.2020 opto-electrical transfer function (OETF / OECF).
Parameters: - E (numeric or array_like) – 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, optional) – Recommendation ITU-R BT.2020 constants.
Returns: Resulting non-linear signal \(E'\).
Return type: numeric or ndarray
Notes
Domain Scale - Reference Scale - 1 E
[0, 1] [0, 1] Range Scale - Reference Scale - 1 E_p
[0, 1] [0, 1] References
Examples
>>> oetf_BT2020(0.18) # doctest: +ELLIPSIS 0.4090077...