colour.models.log_encoding_CanonLog3

colour.models.log_encoding_CanonLog3(x, bit_depth=10, out_normalised_code_value=True, in_reflection=True, **kwargs)

Defines the Canon Log 3 log encoding curve / opto-electronic transfer function.

Parameters

• x (numeric or array_like) – Linear data \(x\).

• bit_depth (int, optional) – Bit depth used for conversion.

• out_normalised_code_value (bool, optional) – Whether the Canon Log 3 non-linear data is encoded as normalised code values.

• in_reflection (bool, optional) – Whether the light level \(x\) to a camera is reflection.

Other Parameters

**kwargs (dict, optional) – Keywords arguments for deprecation management.

Returns

Canon Log 3 non-linear data.

Return type

numeric or ndarray

Notes

• Introspection of the grafting points by Shaw, N. (2018) shows that the Canon Log 3 IDT was likely derived from its encoding curve as the later is grafted at +/-0.014:

  >>> clog3 = 0.04076162
  >>> (clog3 - 0.073059361) / 2.3069815
  -0.014000000000000002
  >>> clog3 = 0.105357102
  >>> (clog3 - 0.073059361) / 2.3069815
  0.013999999999999997
  

Notes

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

Range	Scale - Reference	Scale - 1
clog3	[0, 1]	[0, 1]

References

[Can16]

Examples

>>> log_encoding_CanonLog3(0.18) * 100  
34.3389369...