colour.models.log_encoding_ARRILogC3#

colour.models.log_encoding_ARRILogC3(x: ArrayLike, firmware: Union[Literal['SUP 2.x', 'SUP 3.x'], str] = 'SUP 3.x', method: Union[Literal['Linear Scene Exposure Factor', 'Normalised Sensor Signal'], str] = 'Linear Scene Exposure Factor', EI: Literal[160, 200, 250, 320, 400, 500, 640, 800, 1000, 1280, 1600] = 800) NDArrayFloat[source]#

Define the ARRI LogC3 log encoding curve / opto-electronic transfer function.

Parameters:
  • x (ArrayLike) – Linear data \(x\).

  • firmware (Union[Literal['SUP 2.x', 'SUP 3.x'], str]) – Alexa firmware version.

  • method (Union[Literal['Linear Scene Exposure Factor', 'Normalised Sensor Signal'], str]) – Conversion method.

  • EI (Literal[160, 200, 250, 320, 400, 500, 640, 800, 1000, 1280, 1600]) – Exposure Index \(EI\).

Returns:

ARRI LogC3 encoded data \(t\).

Return type:

numpy.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_ARRILogC3(0.18)  
0.3910068...