colour.models.eotf_inverse_BT1886

colour.models.eotf_inverse_BT1886(L: Annotated[_Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str], 1], L_B: float = 0, L_W: float = 1) → Annotated[ndarray[tuple[Any, ...], dtype[float16 | float32 | float64]], 1]

Apply the Recommendation ITU-R BT.1886 inverse electro-optical transfer function (EOTF) for flat panel displays.

Parameters:

• L (Annotated[_Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str], 1]) – Screen luminance in \(cd/m^2\).

• L_B (float) – Screen luminance for black in \(cd/m^2\).

• L_W (float) – Screen luminance for white in \(cd/m^2\).

Returns:

Input video signal level (normalised, with black at \(V = 0\) and white at \(V = 1\)). For content mastered per Recommendation ITU-R BT.709, 10-bit digital code values \(D\) map into values of \(V\) per the following equation: \(V = (D-64)/876\)

Return type:

numpy.ndarray

Notes

Domain	Scale - Reference	Scale - 1
L	1	1

Range	Scale - Reference	Scale - 1
V	1	1

References

[InternationalTUnion11a]

Examples

>>> eotf_inverse_BT1886(0.11699185725296059)
0.4090077...