Subtractive Colour and Additive Colour
Subtractive colour is achieved by mixing the colours Cyan, Magenta, Yellow to make K (Black).
This method is used in offset printing, paints, plastics, fabric and photography and is called C,M,Y,K format.
Additive colour is achieved when mixing Red, Green and Blue together to get different colours. This system uses a white light yield and is used in televisions, monitors, cameras, scanners and is called RGB format.
How does the eye perceive colour?
In the back of the human eyes there are three cones that are capable of responding to the 3 colours Red, Green and Blue.
Because of their physiological response the eye can be "fooled" into seeing a larege cariation of colours by adjusting the 3 main ones.
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