The Chromaticity diagram overlooks luminance, a crucial dimension for mapping colours. The true colour gamut is represented by colour volume charts as was recognised by CIE in 2021.

The colour usually referred to as purple is actually a mix of a range of colors that fall between the spectral colors of red and violet on the CIE Chromaticity Diagram.

Illuminance is measured in the range from 0.1 to 15,000 lux, while light source colour is reported in CIE x and CIE y (1931) chromaticity coordinates and correlated colour temperature. ColorBUG is ...