ygor/paperclip-rounded-corners — pull request #1 by qiushihe (2014-03-15 01:24:44+00:00)
Title: Command params update and better masking method

Instead of using `+matte` and `-compose CopyOpacity` which doesn't preserve transparent parts of the original image, the new method constructs essentially a transparent round-rectangle with white background and apply `-compose Dst_Out`which preserves any transparency in the original image.