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.2020’, ‘ITU-R BT.2100 HLG’, ‘ITU-R BT.2100 PQ’, ‘ITU-R BT.601’, ‘SMPTE 240M’, ‘ST 2084’}, Opto-electronic transfer function (OETF / OECF).
- Other Parameters
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.is_12_bits_system (bool, optional) – {
colour.models.oetf_BT2020()}, ITU-R BT.2020 alpha and beta constants are used if system is not 12-bit.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...