>The marching ants are not the limit of the selection, they are where
>selection has a 50% value, so pixels outside the area marked by the
>can be partially selected. Each time you paint over them they are 
>painted slightly. This isn't noticeable on the first strokes but
>more visible after several strokes.
>For what you want to do, protecting pixels with a selection isn't an 
>efficient technique (problems such a the one above, halos, jagged 
>edges...). You should be using Color-to-alpha (or paint in Color Erase
>mode) to remove the old color, and apply the new color in "Behind"
>Some more explanations here: 

Thanks, this is way better than what I was doing.

wizzythegrape (via www.gimpusers.com/forums)
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