colour.models.oetf_ARIBSTDB67

colour.models.oetf_ARIBSTDB67(E: ArrayLike, r: ArrayLike = 0.5, constants: Structure = CONSTANTS_ARIBSTDB67) → NDArrayFloat

Define ARIB STD-B67 (Hybrid Log-Gamma) opto-electrical transfer function (OETF).

Parameters:

• E (ArrayLike) – Voltage normalised by the reference white level and proportional to the implicit light intensity that would be detected with a reference camera color channel R, G, B.

• r (ArrayLike) – Video level corresponding to reference white level.

• constants (Structure) – ARIB STD-B67 (Hybrid Log-Gamma) constants.

Returns:

Resulting non-linear signal \(E'\).

Return type:

numpy.ndarray

Notes

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

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

• This definition uses the mirror negative number handling mode of colour.models.gamma_function() definition to the sign of negative numbers.

References

[AssociationoRIaBusinesses15]

Examples

>>> oetf_ARIBSTDB67(0.18)  
0.2121320...