colour.models.rgb.transfer_functions.red_log Module

RED Log Encodings

Defines the RED log encodings:

See also

RGB Colourspaces IPython Notebook

References

[1]Sony Imageworks. (2012). make.py. Retrieved November 27, 2014, from https://github.com/imageworks/OpenColorIO-Configs/blob/master/nuke-default/make.py
colour.models.rgb.transfer_functions.red_log.log_encoding_REDLog(x, black_offset=0.009955040995908344)[source]

Defines the REDLog log encoding curve / opto-electronic transfer function.

Parameters:
  • x (numeric or array_like) – Linear data \(x\).
  • black_offset (numeric or array_like) – Black offset.
Returns:

Non-linear data \(y\).
Return type:

numeric or ndarray

Examples

>>> log_encoding_REDLog(0.18)  
0.6376218...
colour.models.rgb.transfer_functions.red_log.log_decoding_REDLog(y, black_offset=0.009955040995908344)[source]

Defines the REDLog log decoding curve / electro-optical transfer function.

Parameters:
  • y (numeric or array_like) – Non-linear data \(y\).
  • black_offset (numeric or array_like) – Black offset.
Returns:

Linear data \(x\).
Return type:

numeric or ndarray

Examples

>>> log_decoding_REDLog(0.637621845988175)  
0.1...
colour.models.rgb.transfer_functions.red_log.log_encoding_REDLogFilm(x, black_offset=0.0107977516232771)[source]

Defines the REDLogFilm log encoding curve / opto-electronic transfer function.

Parameters:
  • x (numeric or array_like) – Linear data \(x\).
  • black_offset (numeric or array_like) – Black offset.
Returns:

Non-linear data \(y\).
Return type:

numeric or ndarray

Examples

>>> log_encoding_REDLogFilm(0.18)  
0.4573196...
colour.models.rgb.transfer_functions.red_log.log_decoding_REDLogFilm(y, black_offset=0.0107977516232771)[source]

Defines the REDLogFilm log decoding curve / electro-optical transfer function.

Parameters:
  • y (numeric or array_like) – Non-linear data \(y\).
  • black_offset (numeric or array_like) – Black offset.
Returns:

Linear data \(x\).
Return type:

numeric or ndarray

Examples

>>> log_decoding_REDLogFilm(0.457319613085418)  
0.1799999...