Haha.
Maybe try Layer➔Matting➔Defringe
/helpfull blog
( the_rhyme_minister is on a new wave tip, Thu 10 Apr 2008, 17:08, archived)

I did not get that option so just smudged the edges...

( Wobbly Bloke putting the War into awkwardness on, Thu 10 Apr 2008, 17:14, archived)