In the case of computer technology an artefact is a byproduct of a compression method or transmission system - some undesirable alteration or degradation of the original data.
For example, JPEG compression can result in very unpleasant blurring, ghosting and patchiness in images when applied at an extremely aggressive level or when applied repeatedly to an image.
cf. aliasing, anti-aliasing, JPEG, interpolation, lossy.
Entry last updated 2002-04-03. Term 77 of 1487.
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