title: How to draw transparent polygons?
body: <p>I'm using PIL (Python Imaging Library).  I'd like to draw transparent polygons.  It seems that specifying a fill color that includes alpha level does not work.  Are their workarounds?</p>
  
  <p>If it can't be done using PIL I'm willing to use something else.</p>
  
  <p>If there is more than one solution, then performance should be factored in.  The drawing needs to be as fast as possible.</p>