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Additive colour mixing

The principle of additive colour mixing applies to colours emanating from light sources.

The superposition of the three primary colours, red, green and blue (RGB) of the same intensity produces white. Two colours that overlap, for example red and green, produce a new colours, yellow. Both light rays meet at the same point on the eye's retina, and together, add up to a new colour impression.


Additive colour mixing is used in computer screens, TVs, projectors, scanners and digital cameras. In contrast, subtractive colour mixing is used in printing.

In additive colour mixing, the primary colours RGB produce white light