[GRASSLIST:4886] remove small islands

[Martin Wegmann]

hello,

I tried to remove islands in a classified raster image which are smaller than 
1 -2 pixel. 

Is there any command which removes small islands and assigns the prevailing 
value of the surrounding area to this island? 

r.neighbors might be what I want if there would a method=dominant/prevailing 
value, method=average just smoothed the image. 

any ideas? thanks in advance, Martin