colour.colorimetry.yellowness_ASTMD1925¶
-
colour.colorimetry.
yellowness_ASTMD1925
(XYZ)[source]¶ Returns the yellowness index \(YI\) of given sample CIE XYZ tristimulus values using ASTM D1925 method.
ASTM D1925 has been specifically developed for the definition of the Yellowness of homogeneous, non-fluorescent, almost neutral-transparent, white-scattering or opaque plastics as they will be reviewed under daylight condition. It can be other materials as well, as long as they fit into this description.
- 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_ASTMD1925(XYZ) 10.2999999...