colour.yellowness¶
-
colour.
yellowness
(XYZ, method='ASTM E313', **kwargs)[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’, ‘ASTM E313 Alternative’}, Computation method.
- Other Parameters
C_XZ (array_like, optional) – {
colour.colorimetry.yellowness_ASTME313()
}, Coefficients \(C_X\) and \(C_Z\) for the CIE 1931 2 Degree Standard Observer and CIE 1964 10 Degree Standard Observer and CIE Illuminant C and CIE Standard Illuminant D65.- 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
[ASTMInternational15b], [XRitePantone12]
Examples
>>> XYZ = np.array([95.00000000, 100.00000000, 105.00000000]) >>> yellowness(XYZ) 4.3400000... >>> yellowness(XYZ, method='ASTM E313 Alternative') 11.0650000... >>> yellowness(XYZ, method='ASTM D1925') 10.2999999...