colour.models.log_encoding_ALEXALogC

colour.models.log_encoding_ALEXALogC(x, firmware='SUP 3.x', method='Linear Scene Exposure Factor', EI=800)[source]

Defines the ARRI ALEXA Log C log encoding curve / opto-electronic transfer function.

Parameters:
  • x (numeric or array_like) – Linear data \(x\).
  • firmware (unicode, optional) – {‘SUP 3.x’, ‘SUP 2.x’}, Alexa firmware version.
  • method (unicode, optional) – {‘Linear Scene Exposure Factor’, ‘Normalised Sensor Signal’}, Conversion method.
  • EI (int, optional) – Ei.
Returns:

ARRI ALEXA Log C encoded data \(t\).

Return type:

numeric or ndarray

References

[ARRI2012a]

Notes

Domain Scale - Reference Scale - 1
x [0, 1] [0, 1]
Range Scale - Reference Scale - 1
t [0, 1] [0, 1]

Examples

>>> log_encoding_ALEXALogC(0.18)  # doctest: +ELLIPSIS
0.3910068...