colour.yellowness¶

colour.yellowness(XYZ, method='ASTM E313')[source]¶

Returns the yellowness \(W\) using given method.

Parameters:	XYZ (array_like) – CIE XYZ tristimulus values of sample. method (unicode, optional) – {‘ASTM E313’, ‘ASTM D1925’}, Computation method.
Returns:	yellowness \(Y\).
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

[X-Rite2012a]

Examples

>>> import numpy as np
>>> XYZ = np.array([95.00000000, 100.00000000, 105.00000000])
>>> yellowness(XYZ)  # doctest: +ELLIPSIS
11.0650000...
>>> method = 'ASTM D1925'
>>> yellowness(XYZ, method=method)  # doctest: +ELLIPSIS
10.2999999...