colour.colorimetry.yellowness_ASTME313¶

colour.colorimetry.yellowness_ASTME313(XYZ)[source]¶

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

Notes

Domain	Scale - Reference	Scale - 1
`XYZ`	[0, 100]	[0, 1]

Range	Scale - Reference	Scale - 1
`YI`	[0, 100]	[0, 1]

References

Examples

>>> import numpy as np
>>> XYZ = np.array([95.00000000, 100.00000000, 105.00000000])
>>> yellowness_ASTME313(XYZ)  # doctest: +ELLIPSIS
11.0650000...