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This was posted on HN a while back, really impressive: http://clippingmagic.com/

I've tried it with the sneakers sample but the results are disappointing. It had a hard time differentiate the brown of the background and the welt.

You need a couple of extra markings, but that's life on images with background colors close to the foreground colors.

(I'm one of the creators of clippingmagic.com)