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

References

• [SonyImageworks12]

Examples

>>> log_encoding_PivotedLog(0.18)  
0.4349951...