colour.models.oetf_inverse_H273_Log

colour.models.oetf_inverse_H273_Log(V: ArrayLike) → NDArrayFloat

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

Parameters:

V (ArrayLike) – Electrical signal \(V\).

Returns:

Corresponding scene Luminance \(L_c\).

Return type:

numpy.ndarray

Notes

Range	Scale - Reference	Scale - 1
V	[0, 1]	[0, 1]

Domain	Scale - Reference	Scale - 1
L_c	[0, 1]	[0, 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