11.6. Additive perceptual colour models
As mentioned in Section 11.4.1, RGB colour models are aimed at representing colours created in reproduction systems. Thus, the combination of RGB components can be not intuitive to human interpretation. That is, it is difficult to determine the precise values that should have colour components that create a particular colour. Even when using the visualisation of the RGB colour cube, the interpretation of colours is not simple since perceptual properties such as the colour brightness vary indistinctly along the RGB axes. Of course that the chromaticity diagram is very useful to visualise the relationships and properties of RGB colours. However, since this diagram is defined in the XYZ colour space, then ...
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