Hue refers to the perceived difference between one colour and another and accounts for colour names such as red, yellow, green or blue.
Hue can be measured as a location on a colour wheel and expressed in degrees between 00 and 2590.
Saturation refers to the perceived difference between one colour and another in terms of purity.
Saturation is measured between a fully saturated colour (100%) and an unsaturated colour (0%).
Saturation determines the vividness and richness of colours. Highly saturated colours appear vibrant, while desaturated colours appear muted or pastel-like.
A fully saturated colour is produced by a single wavelength or a narrow band of wavelengths of light.
On HSB colour wheels, saturation is usually shown to increase from the centre to the circumference.
Brightness (colour brightness) refers to the difference between a hue that appears bold and vivid at maximum brightness (100%) and then appears progressively darker in tone until it appears black at minimum brightness(0%).
Colour brightness is often apparent in the difference between the way a colour appears to an observer in well-lit conditions compared with its subdued appearance when in shadow or when poorly illuminated.