colour.models.oetf_BT709

colour.models.oetf_BT709(L: 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-R BT.709-6 opto-electronic transfer function (OETF).

Parameters:

L (Annotated[_Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str], 1]) – Luminance \(L\) of the image.

Returns:

Electrical signal \(V\).

Return type:

numpy.ndarray

Notes

Domain	Scale - Reference	Scale - 1
L	1	1

Range	Scale - Reference	Scale - 1
V	1	1

References

[InternationalTUnion15b]

Examples

>>> oetf_BT709(0.18)
0.4090077...