colour.models.log_encoding_NLog

colour.models.log_encoding_NLog(y: ArrayLike, bit_depth: int = 10, out_normalised_code_value: bool = True, in_reflection: bool = True, constants: Structure = CONSTANTS_NLOG) → NDArrayFloat

Define the Nikon N-Log log encoding curve / opto-electronic transfer function.

Parameters:

• y (ArrayLike) – Reflectance \(y\), “y = 0.18” is equivalent to Stop 0.

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

• out_normalised_code_value (bool) – Whether the non-linear Nikon N-Log data \(x\) is encoded as normalised code values.

• in_reflection (bool) – Whether the light level :math`in` to a camera is reflection.

• constants (Structure) – Nikon N-Log constants.

Returns:

N-Log 10-bit equivalent code value \(x\).

Return type:

numpy.ndarray

Notes

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

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

References

[Nikon18]

Examples

>>> log_encoding_NLog(0.18)  
0.3636677...