Colour Wheel

The Colour wheel is an abstract organisation of colours around a circle showing the relationships between primary colors, secondary colors, tertiary colors etc.

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Colours of the colour wheel

Some use the term Colour Wheel or Colour circle interchangeably.
The typical colour wheel usually includes primary colours (blue, red and yellow) secondary colours (green, orange and violet/purple) and the tertiary colours ( red-orange, yellow-orange,yellow–green, blue–violet and blue–green)

The colour wheel is based one RGB (red, green, blue) and RGV (red, green, violet)
RGB is used to display LED's. each colour can be a fraction of 255 variables. when 0/255 the LED is off, and when 255/255, the LED is fully on. By lighting each LED at different levels, different colours can be created. this is called additive colour as adding colour will make the colour closer to white.

CYMK is the other way colour can be created by machines. Cyan, Yellow, Magenta and Key (Black) are mixed to display different colours. CYMK is subtractive as by adding more colour further removes the colour away from white.

Colour Schemes

Colour schemes are a logical combinations of colours on the colour wheel. An example of colour schemes are complimentary colours, these are colours which together make either white or black ( subtractive or additive colours.)
This means the colours need to be polar opposites and a primary and secondary colour. An example of this is blue and orange. because they are polar opposites on the colour wheel they look pleasant together.
The other kind of complimentary colour is the Split Complimentary Colour. This is where instead of being polar opposites, the colour which is the base, instead of using the secondary colour opposite it the two tertiary colours next to the opposite secondary are used. for example, Blue's opposite is orange, so instead of using pure orange (equal parts yellow and red,) the two tertiary colours next to pure orange will be used. In this case, red-orange and yellow orange. Because together the two complimentary colours still contain the same ratio of colour as the secondary, the balance is still maintained so the two are still polar opposites of blue. this means you have more colours to use while still keeping the same colour scheme.

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