Chromaticity refers to the quality of a colour that sets it apart from white, grey, or black.
The chromaticity of different colours is often described by chromaticity coordinates that define where a colour appears within a colour space.
When chromaticity is shown in a diagram, hue and saturation are displayed without mentioning their brightness.
The simplest way to understand chromaticity is through a chromaticity diagram that creates a two-dimensional visual display of all the colours produced by a specific colour space.
The most common chromaticity diagrams showcase the full range of colours visible to a human observer under ideal conditions. The position of each colour is plotted using the range of colour values (chromaticity coordinates) described by the CIE (1931) XYZ colour space.
Some chromaticity diagrams illustrating the CIE (1931) XYZ colour space include overlays of the smaller gamuts of colour spaces associated with different mediums, lighting conditions, and devices.
Examples of colour spaces with smaller gamuts than the CIE (1931) XYZ colour space include: