colour.models.oetf_inverse_ARIBSTDB67

colour.models.oetf_inverse_ARIBSTDB67(E_p, r=0.5, constants={'a': 0.17883277, 'b': 0.28466892, 'c': 0.55991073})[source]

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

Parameters:
  • E_p (numeric or array_like) – Non-linear signal \(E'\).
  • r (numeric, optional) – Video level corresponding to reference white level.
  • constants (Structure, optional) – 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:

numeric or 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

[AssociationofRadioIndustriesandBusinesses2015a]

Examples

>>> oetf_inverse_ARIBSTDB67(0.212132034355964)  # doctest: +ELLIPSIS
0.1799999...