The Secret... Noise
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Dithering requires the addition of spatial noise to the original signal
(color intensity). This noise can be regular (a repeated signal
that is independent of either the input or output), correlated
(a signal that is related to the input), random, or some
combination.
Dithering can be neatly summarized as a quantization process
where noise has has been introduced to the input. The character
of the dither is determined entirely by the structure of the noise.
Note: Dithering decreases the SNR yet improves the percieved quality of the output.
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