The Gibb Effect is an MPEG compression artefact. It is a blurring of the outline of sharp objects, with inappropriately-coloured pixels appearing around the outline of the object. The commonest area in which the Gibb Effect is seen is during end credits, where insufficient bits have been allocated to compressing the data. Another name for this artefact is mosquito noise.[http://www.michaeldvd.com/Articles/VideoArtefacts/VideoArtefactsGibbsEffect.html]