Colours can be split into two other categories; Warm and Cool colours. Colours can be described in such way because warm colours like red, yellow, orange, etc, are very vibrant and lively where as cool colours like blue, purple, green, etc, seem more relaxing and calm. Certain emotions can be shown through colours.
Hue, saturation and value are the three elements that create what we see as ‘colour’. Faber Birren (consultant on colour and colour theory) describes colour as a triangle explaining how a colour is formed from three points; white, black and a hue (pure colour) and a gradient of shades, tints and tone in between.
One can change the shade, tint and tone of a pure colour by adding black, white or grey respectively