colour.models.oetf_inverse_H273_Log

colour.models.oetf_inverse_H273_Log(V: Annotated[_Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str], 1]) → Annotated[ndarray[tuple[Any, ...], dtype[float16 | float32 | float64]], 1]

Apply the Recommendation ITU-T H.273 inverse opto-electronic transfer function (OETF) for logarithmic encoding with 100:1 dynamic range.

Parameters:

V (Annotated[_Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str], 1]) – Electrical signal \(V\).

Returns:

Scene luminance \(L_c\).

Return type:

numpy.ndarray

Notes

Domain	Scale - Reference	Scale - 1
V	1	1

Range	Scale - Reference	Scale - 1
L_c	1	1

References

[InternationalTUnion21]

Warning

• The function is clamped to domain [colour.models.oetf_H273_Log() (0.01), np.inf].

Examples

>>> oetf_inverse_H273_Log(0.6276362525516)
0.17999999...
>>> oetf_inverse_H273_Log(0.0)
0.01
>>> oetf_inverse_H273_Log(1.0)
1.0