colour_science_spd_to_xyz_tristimulus_and_cie_xy_chromaticity.py

1import colour
2
3# Objects can be searched using the "colour.search_datasets" definition:
4print(colour.search_datasets("object_spectrally_sampled", "ColorChecker"))
5
6# Retrieving a "ColorChecker" "spectral power distribution" (SPD):
7# "ColorChecker N24" (after 2014) is used here.
8spd = colour.SDS_ILLUMINANTS["ColorChecker N24"]["dark skin"]
9print(f"Spectral Power Distribution: \n{spd}")
10
11# Converting the SPD to "CIE XYZ" tristimulus values:
12# We use the "CIE 1931 2 Degree Standard Observer" and "CIE Illuminant D65".
13XYZ = colour.sd_to_XYZ(spd)
14print(f"Tristimulus Values: \n{XYZ}")
15
16# Converting "CIE XYZ" tristimulus values to "CIE xy" chromaticity coordinates:
17xy = colour.XYZ_to_xy(XYZ)
18print(f"Chromaticity Coordinates: \n{xy}")