colour.models.eotf_inverse_H273_ST428_1

colour.models.eotf_inverse_H273_ST428_1(L_o: 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 SMPTE ST 428-1 (2019) inverse electro-optical transfer function (EOTF) as specified in ITU-T H.273.

Parameters:

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

Returns:

Electrical signal \(V\).

Return type:

numpy.ndarray

Notes

• The function specified in [InternationalTUnion21] multiplies \(L_o\) by 48, contrary to what is specified in [SocietyoMPaTEngineers19] and colour.models.eotf_inverse_DCDM().

Domain	Scale - Reference	Scale - 1
L_o	1	1

Range	Scale - Reference	Scale - 1
V	1	1

References

• [InternationalTUnion21], [SocietyoMPaTEngineers19]

Examples

>>> eotf_inverse_H273_ST428_1(0.18)
0.5000483...