This entry discusses colour brightness and the HSB colour model, where H represents hue, S represents saturation, and B represents brightness.
Colour brightness can be understood as the variation in how a colour is perceived by an observer under well-lit conditions compared to its more muted appearance when in shadow or under poor illumination.
In the HSB colour model:
Hue refers to the perceived difference between colours and is usually described using names such as red, yellow, green, or blue.
Saturation refers to the vividness of a colour compared to an unsaturated colour.
Brightness refers to the perceived difference in the appearance of colours under ideal sunlit conditions compared to poor lighting conditions where a hue’s vitality is lost.
Brightness can be measured as a percentage from 100% to 0%.
As the brightness of a fully saturated hue decreases, it appears progressively darker and achromatic.