Chromaticity is an objective specification of the quality of a color regardless of its luminance, that is, as determined by its colorfulness (or saturation, chroma, intensity, or excitation purity) and hue.[1][2]
In color science, the white point of an illuminant or of a display is a neutral reference characterized by a chromaticity; for example, the white point of an sRGB display is an x,y chromaticity of [0.3127,0.3290]. All other chromaticities may be defined in relation to this reference using polar coordinates. The hue is the angular component, and the purity is the radial component, normalized by the maximum radius for that hue.
