colour.models.rgb.transfer_functions.pivoted_log Module¶
Pivoted Log Encoding¶
Defines the Pivoted Log encoding:
See also
References
[1] | Sony Imageworks. (2012). make.py. Retrieved November 27, 2014, from https://github.com/imageworks/OpenColorIO-Configs/blob/master/nuke-default/make.py |
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colour.models.rgb.transfer_functions.pivoted_log.
log_encoding_PivotedLog
(x, log_reference=445, linear_reference=0.18, negative_gamma=0.6, density_per_code_value=0.002)[source]¶ Defines the Josh Pines style Pivoted Log log encoding curve / opto-electronic transfer function.
Parameters: - x (numeric or array_like) – Linear data \(x\).
- log_reference (numeric or array_like) – Log reference.
- linear_reference (numeric or array_like) – Linear reference.
- negative_gamma (numeric or array_like) – Negative gamma.
- density_per_code_value (numeric or array_like) – Density per code value.
Returns: Non-linear data \(y\).
Return type: numeric or ndarray
Examples
>>> log_encoding_PivotedLog(0.18) 0.4349951...
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colour.models.rgb.transfer_functions.pivoted_log.
log_decoding_PivotedLog
(y, log_reference=445, linear_reference=0.18, negative_gamma=0.6, density_per_code_value=0.002)[source]¶ Defines the Josh Pines style Pivoted Log log decoding curve / electro-optical transfer function.
Parameters: - y (numeric or array_like) – Non-linear data \(y\).
- log_reference (numeric or array_like) – Log reference.
- linear_reference (numeric or array_like) – Linear reference.
- negative_gamma (numeric or array_like) – Negative gamma.
- density_per_code_value (numeric or array_like) – Density per code value.
Returns: Linear data \(x\).
Return type: numeric or ndarray
Examples
>>> log_decoding_PivotedLog(0.434995112414467) 0.1...