Another way to approach dithering is to analyse the input image in order to make informed decisions about how best to perturb pixel values prior to quantisation. Error-diffusion dithering does this by sequentially taking the quantisation error for the current pixel (the difference between the input value and the quantised value) and distributing it to surrounding pixels in variable proportions according to a diffusion kernel . The result is that input pixel values are perturbed just enough to compensate for the error introduced by previous pixels.
"It depends on the scale at which it happens," says Jackson of Capital Economics.
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"They need to get to a resolution," according to Emelia Probasco, Senior Fellow at Georgetown University's Center for Security and Emerging Technology.
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