colour.colorimetry.yellowness_ASTME313#

Compute the yellowness index \(YI\) of the specified sample CIE XYZ tristimulus values using the ASTM E313 method.

ASTM E313 has been successfully used for a variety of white or near white materials. This includes coatings, plastics, and textiles.

Parameters:

XYZ (Annotated[_Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str], 100]) – CIE XYZ tristimulus values of the sample.
C_XZ (ArrayLike) – Coefficients \(C_X\) and \(C_Z\) for the CIE 1931 2 Degree Standard Observer and CIE 1964 10 Degree Standard Observer with CIE Illuminant C and CIE Standard Illuminant D65.

Returns:

Yellowness index \(YI\).

Return type:

numpy.ndarray

Notes

Domain	Scale - Reference	Scale - 1
`XYZ`	100	1

Range	Scale - Reference	Scale - 1
`YI`	100	1

References

Examples

>>> XYZ = np.array([95.00000000, 100.00000000, 105.00000000])
>>> yellowness_ASTME313(XYZ)
np.float64(4.3400000...)