FWIW, another way to do that is

 (linewidth #f (disk 50))

At Sun, 10 Jun 2012 19:10:39 +0200, Jens Axel Søgaard wrote:
> 2012/6/10 Robby Findler <[email protected]>:
> > I think it does, actually. What's happening is that it is drawing the
> > interior with the specified alpha value and then drawing the border
> > with the specified alpha, which means that pixels near the border are
> > drawn twice and so appear twice as dark.
> >
> > I've just pushed a change so that you can pass the #:draw-border?
> > argument to disk and filled-ellipse to avoid drawing the border.
> 
> Great.
> 
> Thanks,
> Jens Axel
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