This is one of my plugins for ArtEffect2/3+.
SmartMedian is a median-filter that blurs a picture without loosing sharp
edges. It can remove noise visible in large equal areas and leaving details
untouched. It is well suited to remove moirés from scanned printings without
smoothing the details out. Very useful if natural pictures are mixed with
artifical graphics/text, e.g. cover of a CD.
Medianfilter of this type are sometimes known as despeckle filters.
There is another similar plugin available: SmartBlur
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