Excitation Purity
It is the relative distance from the White Point to the furthest point on the chromaticity diagram with the same 'dominant wavelength' or Hue.
It is the same as Saturation in the HSV colour model.
It is the relative distance from the White Point to the furthest point on the chromaticity diagram with the same 'dominant wavelength' or Hue.
It is the same as Saturation in the HSV colour model.