colour.models.log_encoding_PivotedLog

colour.models.log_encoding_PivotedLog(x, 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 encoding curve / opto-electronic transfer function.

Parameters

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

• 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

Non-linear data \(y\).

Return type

numeric or ndarray

Notes

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

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

References

[SonyImageworks12]

Examples

>>> log_encoding_PivotedLog(0.18)  
0.4349951...