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Glossary > Photography >Aliasing
Aliasing
A set of problematic effects resulting from the usual method of displaying *scalable images on low-resolution screens. When converting these images to *bitmaps for display, samples are taken from the theoretical mathematical image, usually at the pixel centres. The influence of what is happening at these more or less arbitrary points is thereby greatly exaggerated, causing jagged edges, "pimples" and other undesirable effects. (We should really be considering what is happening over the complete area covered by each pixel.) The approach to the problem that takes the generic term, *anti-aliasing, normally denotes careful shading of border pixels. Another approach (distinct but complementary) is *hinting, a set of techniques that can in principle regularize features of any graphic, but in practice is confined to font technology.
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