convert thumbnail.gif
( +clone -threshold -1
-draw 'fill black polygon 0,0 0,15 15,0 fill white circle 15,15 15,0'
( +clone -flip ) -compose Multiply -composite
( +clone -flop ) -compose Multiply -composite
) +matte -compose CopyOpacity -composite rounded_corners.png
from
http://www.imagemagick.org/Usage/thumbnails/#rounded
-
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