Posterisation effects

Posterisation effects

Posterisation traditionally refers to the reduction of an image's palette down to a small number of colours, making it easier to print with a three or four colour separation process, but in these days of photo-quality inkjet printers and full colour copying it's not really used any more. You can produce an effect resembling posterisation by adding more peaks to the tone curve, producing more bands of reversed colour.
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You can either have both ends of the curve down, as shown above, in which case the highlight areas will be reversed, or have the highlight end higher, in which case those area will appear almost normal.
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