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

[ARRI12]

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)  
0.3910068...