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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His first trip into space was aboard the two-man Gemini 7. Lovell and fellow astronaut Frank Borman ate a steak-and-eggs breakfast and blasted off.