> In short, I'm looking for a tool, plug-in etc. which
> collects all isles of a selection up to a certain size
> (specified by maximum diameter or number of pixels) and
> subtracts them from the selection.

It would probably be easier to clean up the image before making the 
selection. Have you experimented with the various non-linear filters? 
I'd try [Filters/Generic/]Erode followed by Dilate (or maybe the other 
way around), or [Filters/Enhance/]Despeckle or [Filters/Emhance/]NL Filter.

David Hodson  --  this night wounds time
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