Chromaticity consists of two independent parameters, often specified as hue ( h ) and colorfulness ( s ), where the latter is alternatively called saturation, chroma, intensity, or excitation purity.
2.
Colors in the Coloroid color space are fundamentally specified according to the perceptual attributes of " luminosity " ( luminance factor, V ), " saturation " ( excitation purity, T ) and hue ( the matching or dominant spectral wavelength, A ).
3.
Illuminant E is not a black body, so it does not have a color temperature, but it can be approximated by a D series illuminant with a CCT of 5455 K . ( Of the canonical illuminants, D 55 is the closest . ) Manufacturers sometimes compare light sources against Illuminant E to calculate the excitation purity.
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