It is an established principle that any colour may be described in terms of red, green and blue (RGB). These are the colour primaries of additive colour; the distinction between adding coloured lights together and reflecting white light from coloured dyes is very important. Additive colour is that produced by the screen of a TV or monitor, where red, green and blue in equal amounts add to make white light (see Figure 5.1).

We must also establish a few other principles before a full understanding of colour can be gained, starting with the picture. Where the picture display screen produces no light, the result is black (assuming ideal viewing conditions with no reflected ambient light). Where the screen produces the ...

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