colour.models.oetf_inverse_ARIBSTDB67

colour.models.oetf_inverse_ARIBSTDB67(E_p: Annotated[_Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str], 1], r: ArrayLike = 0.5, constants: Structure | None = None) → Annotated[ndarray[tuple[Any, ...], dtype[float16 | float32 | float64]], 1]

Apply the ARIB STD-B67 (Hybrid Log-Gamma) inverse opto-electronic transfer function (OETF).

Parameters:

• E_p (Annotated[_Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str], 1]) – Non-linear signal \(E'\).

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

• constants (Structure | None) – ARIB STD-B67 (Hybrid Log-Gamma) constants.

Returns:

Voltage normalised by the reference white level and proportional to the implicit light intensity that would be detected with a reference camera colour channel R, G, B.

Return type:

numpy.ndarray

Notes

Domain	Scale - Reference	Scale - 1
E_p	1	1

Range	Scale - Reference	Scale - 1
E	1	1

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

References

[AssociationoRIaBusinesses15]

Examples

>>> oetf_inverse_ARIBSTDB67(0.212132034355964)
0.1799999...