Image effect for round image corners.
This algorithm is from the phpThumb project available at http://phpthumb.sourceforge.net and all credit (and complaints ;) for this script should go to James Heinrich email@example.com. Modifications made to the code to fit it within the Horde framework and to adjust for our coding standards.
Author: Michael J. Rubinsky firstname.lastname@example.org
Located at Horde/Image/Effect/Gd/RoundCorners.php