colour.colorimetry.yellowness_ASTME313

colour.colorimetry.yellowness_ASTME313(XYZ)

Returns the yellowness index \(YI\) of given sample CIE XYZ tristimulus values using ASTM E313 method.

ASTM E313 has successfully been used for a variety of white or near white materials. This includes coatings, Plastics, Textiles.

Parameters:XYZ (array_like) – CIE XYZ tristimulus values of sample. Returns:Whiteness \(YI\). Return type:numeric or ndarray

Warning

The input domain of that definition is non standard!

Notes

• Input CIE XYZ tristimulus values are in domain [0, 100].

References

• [XRP12]

Examples

>>> import numpy as np
>>> XYZ = np.array([95.00000000, 100.00000000, 105.00000000])
>>> yellowness_ASTME313(XYZ)  
11.0650000...