colour.models.log_decoding_ALEXALogC

colour.models.log_decoding_ALEXALogC(t, firmware='SUP 3.x', method='Linear Scene Exposure Factor', EI=800)[source]

Defines the ARRI ALEXA Log C log decoding curve / electro-optical transfer function.

Parameters
  • t (numeric or array_like) – ARRI ALEXA Log C encoded data \(t\).

  • 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

Linear data \(x\).

Return type

numeric or ndarray

Notes

Domain

Scale - Reference

Scale - 1

t

[0, 1]

[0, 1]

Range

Scale - Reference

Scale - 1

x

[0, 1]

[0, 1]

References

[ARRI12]

Examples

>>> log_decoding_ALEXALogC(0.391006832034084)  
0.18...