colour.oetf¶

colour.oetf(value, function='ITU-R BT.709', **kwargs)[source]¶

Encodes estimated tristimulus values in a scene to \(R'G'B'\) video component signal value using given opto-electronic transfer function (OETF / OECF).

Parameters

value (numeric or array_like) – Value.
function (unicode, optional) – {‘ITU-R BT.709’, ‘ARIB STD-B67’, ‘ITU-R BT.2100 HLG’, ‘ITU-R BT.2100 PQ’, ‘ITU-R BT.601’, ‘SMPTE 240M’, ‘ST 2084’}, Opto-electronic transfer function (OETF / OECF).
E_clip (numeric, optional) – {colour.models.cctf_encoding_RIMMRGB()}, Maximum exposure level.
I_max (numeric, optional) – {colour.models.cctf_encoding_ROMMRGB(), colour.models.cctf_encoding_RIMMRGB()}, Maximum code value: 255, 4095 and 650535 for respectively 8-bit, 12-bit and 16-bit per channel.
r (numeric, optional) – {colour.models.oetf_ARIBSTDB67()}, Video level corresponding to reference white level.

Returns

\(R'G'B'\) video component signal value.

Return type

numeric or ndarray

Examples

>>> oetf(0.18)  
0.4090077...
>>> oetf(0.18, function='ITU-R BT.601')  
0.4090077...