colour.colorimetry.daylight_locus_function

colour.colorimetry.daylight_locus_function(x_D: ArrayLike) → NDArrayFloat

Compute the CIE y chromaticity coordinate on the daylight locus.

Calculate the CIE y chromaticity coordinate on the daylight locus for the specified CIE x chromaticity coordinate \(x_D\) using the quadratic relationship defined by Wyszecki and Stiles.

Parameters:

x_D (ArrayLike) – CIE x chromaticity coordinate \(x_D\) for which to compute the corresponding CIE y coordinate on the daylight locus.

Returns:

CIE y chromaticity coordinate on the daylight locus corresponding to the specified \(x_D\).

Return type:

numpy.ndarray

References

[WS00a]

Examples

>>> daylight_locus_function(0.31270)
0.3291051...