[Image-SIG] Simple ICO => PNG conversion problem

[David Koblas]

I know I've missed something here, but the trivial problem I'm having is 
(I'm really doing this in a larger context, but this shows the problem):

    $ wget http://twitter.com/favicon.ico
    $ pilconvert.py favicon.ico favicon.png

If I then look at the PNG image the transparency is missing from the ICO 
image.  Strikes me as a simple known problem, but I don't see any 
workaround.