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Aliasing is a reduction in image quality caused by representing images with discrete pixels. More accurately,
aliasing is a signal processing problem that results from the insufficient sampling of frequencies above the Nyquist limit. These high frequencies appear 'under the alias of' lower frequencies after sampling. In rendering, the term often refers to a type of aliasing known as
jaggies. These occur when vectors or object edges are rendered with a jagged stair-case effect, to which near horizontal or near vertical lines are particularly prone. Such effects are called aliased artifacts. See also
anti-aliasing.
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