colour.is_within_visible_spectrum#

colour.is_within_visible_spectrum(XYZ: ArrayLike, cmfs: Optional[MultiSpectralDistributions] = None, illuminant: Optional[SpectralDistribution] = None, tolerance: Optional[Floating] = None, **kwargs: Any) NDArray[source]#

Return whether given CIE XYZ tristimulus values are within the visible spectrum volume, i.e. Rösch-MacAdam colour solid, for given colour matching functions and illuminant.

Parameters
  • XYZ (ArrayLike) – CIE XYZ tristimulus values.

  • cmfs (Optional[MultiSpectralDistributions]) – Standard observer colour matching functions, default to the CIE 1931 2 Degree Standard Observer.

  • illuminant (Optional[SpectralDistribution]) – Illuminant spectral distribution, default to CIE Illuminant E.

  • tolerance (Optional[Floating]) – Tolerance allowed in the inside-triangle check.

  • kwargs (Any) – {colour.msds_to_XYZ()}, See the documentation of the previously listed definition.

Returns

Are CIE XYZ tristimulus values within the visible spectrum volume, i.e. Rösch-MacAdam colour solid.

Return type

numpy.ndarray

Notes

Domain

Scale - Reference

Scale - 1

XYZ

[0, 1]

[0, 1]

Examples

>>> import numpy as np
>>> is_within_visible_spectrum(np.array([0.3205, 0.4131, 0.51]))
array(True, dtype=bool)
>>> a = np.array([[0.3205, 0.4131, 0.51],
...               [-0.0005, 0.0031, 0.001]])
>>> is_within_visible_spectrum(a)
array([ True, False], dtype=bool)