According to the definition, we calculate the normalized chromaticity coordinate x, y, z in the equation below, which can be pointed in the chromaticity diagram
32 on the CIE (Commission Internationale de l'Eclairage) 1931 chromaticity diagram
Thresholds that define red-green (RG) and blue-yellow (BY) sensitivity, within the neutral isochromatic zone, are plotted as x, y chromaticity co-ordinates in the CIE chromaticity diagram
That's why the LRC recommends using two metrics: CRI, which measures how similar a light source renders colors compared to a reference illuminant, and the gamut area index (GAI), which evaluates the relative area enclosed by sample colors on a chromaticity diagram
when rendered by the source.
AN ILLUMINANT'S POSITION ON THE CHROMATICITY DIAGRAM
(Figure 1) after exposure correction were close to chromaticity diagram
of standard colour table in a blue field (for the blue the increased colour difference after the correction is result of too much reduction in brightness due to underexposure).
Then we calculated the distance differences of all the data on u-v chromaticity diagram
In 1931, the Committee Internationale de l'Eclairage (CIE) agreed on a reference chromaticity diagram
which is based on the matching characteristics of a standard observer (48,49) and theoretical primary colours which, when mixed in equal amounts, produce equal energy white.