Hue
A.k.a. shade, colouring
The hue is determined by the wave length of a colour, which makes it possible to distinguish between different colours.
A colour is generally characterized by the hue, but also by its lightness and saturation.
The wave length of visible light spans from approx. 400 - 700 nm. The following colours are perceived at the respective wave lenghts:
- Hues
| The spectrum colours | |||
| Hue | Wave length | ||
| Purple | 400-420 nm | ||
| Blue | 420-490 nm | ||
| Green | 490-575 nm | ||
| Yellow | 575-585 nm | ||
| Orange | 585-650 nm | ||
| Red | 650-750 nm |