colour.models.oetf_inverse_H273_IEC61966_2

colour.models.oetf_inverse_H273_IEC61966_2(V)

Define Recommendation ITU-T H.273 inverse opto-electronic transfer function (OETF) for IEC 61966-2 family of transfer functions (2-1 sRGB, 2-1 sYCC, 2-4 xvYCC).

Parameters:

V – Electrical signal \(V\).

Returns:

Corresponding scene luminance \(L_c\).

Return type:

numpy.ndarray

Notes

Usage in [InternationalTUnion21] is as follows:

• For IEC 61966-2-1 sRGB (MatrixCoefficients=0), the function is only defined for \(L_c\) in [0-1] range.

• For IEC 61966-2-1 sYCC (MatrixCoefficients=5) and IEC 61966-2-4 xvYCC, the function is defined for any real-valued \(L_c\).

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

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

References

• [InternationalTUnion21]

Examples

>>> oetf_inverse_H273_IEC61966_2(0.461356129500)  
0.1799999999...
>>> oetf_inverse_H273_IEC61966_2(-0.461356129500)  
-0.1799999999...