colour.models.oetf_H273_Log

colour.models.oetf_H273_Log(L_c)

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

Parameters:

L_c – Scene Luminance \(L_c\).

Returns:

Corresponding electrical signal \(V\).

Return type:

numpy.ndarray

Notes

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

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

References

[InternationalTUnion21]

Warning

• The function is clamped to domain [0.01, np.inf].

Examples

>>> oetf_H273_Log(0.18)  
0.6276362525516...
>>> oetf_H273_Log(0.01)  
0.0
>>> oetf_H273_Log(0.001)  
0.0
>>> oetf_H273_Log(1.0)  
1.0