gfen wrote: > > On Thu, 24 Oct 2002, Dan Scott wrote: > > to add a tiny smidgen of unsharp masking to get the smaller rez image > > What exactly does unsharp mask accomplish?
the name is unfortunate and is derived from true darkroom lingo dealing with a negative sandwich. Unsharp mask increases contrast on edges by lightening the light side and darkening the dark side. Most people use it to increase apparent image sharpness. It's drawback is that it sharpens noise and grain as well as edges. PMI (PoorMan'sIce) will include a few intelligent edge sharpening actions borrowed from the ideas of others. For selective sharpening, Andrew Rodney and a few of the contributors to Lumninous Landscape have a few actions that work well in some cases. -Lon
