Dithering in its simplest form can be understood by observing what happens when we quantise an image with and without modifying the source by random perturbation. In the examples below, a gradient of 256 grey levels is quantised to just black and white. Note how the dithered gradient is able to simulate a smooth transition from start to end.
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Deborah Alsina, chief executive of Arthritis UK, said: "This is a crushing blow for those individuals who have finally made it to the front of the orthopaedic surgery queue after a long time waiting.