colour.colorimetry.whiteness_ASTME313¶

colour.colorimetry.whiteness_ASTME313(XYZ)[source]¶

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

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

Notes

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

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

References

Examples

>>> import numpy as np
>>> XYZ = np.array([95.00000000, 100.00000000, 105.00000000])
>>> whiteness_ASTME313(XYZ)  # doctest: +ELLIPSIS
55.7400000...