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.
Phil Collins: Face Value 59:35
Close up of this credit during its fade-out. Note the pixels that appear
as a halo around the letters.