I've noticed that too when I render out images with an alpha. When I open it in photoship, there's a thin black stroke around where the alpha meets the image. Anyone know the reason for this? I've sort of gotten around it by loading the image and just contracting it 1 pixel, inverting the selection and deleting. Still, I'd like to know how to prevent this from the source. Any ideas?
"Terminat Bora Diem, Terminal Auctor opus."