In gimp you can use the despeckle filter (Filters|Enhance|Despeckle).
I normally turn off all fancy options (adaptive and recursive) and
use a radius of 5 (you can lower this if you scan at lower resolutions).
Caution: the despeckle filter takes ages if you have large images.
If somebody knows a faster filter that looks reasonable, please tell
me.
I scan at the highest reasonable scanner setting (usually 600dpi), then
apply the filter. I usually scale the image down to 300dpi or lower
to save space - the printers cannot print at these resolutions anyway.
Klaus
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