Colour theory is a theory that colours mean different things and react to each other in certain ways. Each colour has its own psychological features such as blue making the viewer feel trust, loyalty, wisdom and sadness. Furthermore colours have different temperatures and can make images feel cold or hot depending on whether its on more of a blue/green scale or red/orange scale.
It also comes into mixing colours such as additive colour mixing or subtractive colour mixing. Additive means that the main three colours are red green and blue and mix to form white, while subtractive colour mixing mixes cyan yellow and magenta to form black. Additive is mostly with computers and lights, and subtractive is paints, printers and everything else.
Colours consist of primary colours, secondary colours and tertiary colours. Primary colours are blue red and yellow, secondary are the result of mixing two primaries together, this consists of orange green and purple. tertiary is everything else. Colour wheels come into play when considering colour opposites, these are the colours that contrast most with each other. These can be found on the exact opposite of the colour wheel.
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