Forms of Colours
1. Primary colours: There are three forms of colours or spectrum which cannot be produced by mixing any colour together. The primary colours are red, green and blue. They occur naturally from the spectrum and they can form other colours when mixed in the same proportion.
2. Secondary colours: There are colours formed from primary colours. They are colours obtained by mixing two of the primary colours together in the same proportion, e.g. when light mixes with blue light, they produce magenta colour, also when blue is mixed with green light, they produce cyan and when a green light is mixed with red light they produce a yellow light.
Red + Green → Yellow
Green + Blue → Cyan
Blue + Red → Cyan
3. Complementary colours: There are two colours which give a white colour when mixed together. Complementary colours are obtained when a secondary colour is mixed with a colour that is not in its component. Complementary colours can be obtained by.
(i) mixing a primary colour with a secondary colour.
(i) mixing two secondary colours.
(iii) mixing the primary colours.
Colour Triangles and Circles
The colour trianges and circles are obtained from the additive colour mixing of primary colours with other colours which are secondary and tertiary colours [complementary]. The colour obtained can be summarized as,
R + B → magenta
R + G → yellow
B + G → cyan
Complementary
R + B + G → white
B + Y → white
R + cyan → white
G + magenta → white
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