colour.wavelength_to_XYZ¶
- colour.wavelength_to_XYZ(wavelength: FloatingOrNDArray, cmfs: Optional[colour.colorimetry.spectrum.MultiSpectralDistributions] = None) numpy.ndarray[source]¶
Convert given wavelength \(\lambda\) to CIE XYZ tristimulus values using given colour matching functions.
If the wavelength \(\lambda\) is not available in the colour matching function, its value will be calculated according to CIE 15:2004 recommendation: the method developed by Sprague (1880) will be used for interpolating functions having a uniformly spaced independent variable and the Cubic Spline method for non-uniformly spaced independent variable.
- Parameters
wavelength (FloatingOrNDArray) – Wavelength \(\lambda\) in nm.
cmfs (Optional[colour.colorimetry.spectrum.MultiSpectralDistributions]) – Standard observer colour matching functions, default to the CIE 1931 2 Degree Standard Observer.
- Returns
CIE XYZ tristimulus values.
- Return type
- Raises
ValueError – If wavelength \(\lambda\) is not contained in the colour matching functions domain.
Notes
Range
Scale - Reference
Scale - 1
XYZ[0, 1]
[0, 1]
Examples
>>> from colour import MSDS_CMFS >>> cmfs = MSDS_CMFS['CIE 1931 2 Degree Standard Observer'] >>> wavelength_to_XYZ(480, cmfs) array([ 0.09564 , 0.13902 , 0.8129501...]) >>> wavelength_to_XYZ(480.5, cmfs) array([ 0.0914287..., 0.1418350..., 0.7915726...])