Saturation

Saturation refers to the perceived vividness of a colour.

  • When colours are more saturated, our eyes interpret it as a colour’s luminance and chroma. This makes us believe that the colours are actually brighter.
  • As saturation decreases, colours appear dull and washed out until all colour disappears leaving only a grey tone.
  • On many colour wheels, saturation increases from the centre to the edge.

https://en.wikipedia.org/wiki/Colorfulness#Saturation