colour.models.oetf_inverse_ARIBSTDB67#

colour.models.oetf_inverse_ARIBSTDB67(E_p: FloatingOrArrayLike, r: FloatingOrArrayLike = 0.5, constants: colour.utilities.data_structures.Structure = CONSTANTS_ARIBSTDB67) FloatingOrNDArray[source]#

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

Parameters
  • E_p (FloatingOrArrayLike) – Non-linear signal \(E'\).

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

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

Returns

Voltage \(E\) 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.

Return type

numpy.floating or numpy.ndarray

Notes

Domain

Scale - Reference

Scale - 1

E_p

[0, 1]

[0, 1]

Range

Scale - Reference

Scale - 1

E

[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_inverse_ARIBSTDB67(0.212132034355964)  
0.1799999...