colour.models.log_decoding_PivotedLog

colour.models.log_decoding_PivotedLog(y, log_reference=445, linear_reference=0.18, negative_gamma=0.6, density_per_code_value=0.002)

Defines the Josh Pines style Pivoted Log log decoding curve / electro-optical transfer function.

Parameters

• y (numeric or array_like) – Non-linear data \(y\).

• log_reference (numeric or array_like) – Log reference.

• linear_reference (numeric or array_like) – Linear reference.

• negative_gamma (numeric or array_like) – Negative gamma.

• density_per_code_value (numeric or array_like) – Density per code value.

Returns

Linear data \(x\).

Return type

numeric or ndarray

Notes

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

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

References

[SonyImageworks12]

Examples

>>> log_decoding_PivotedLog(0.434995112414467)  
0.1...