I have about 1,000 PNG pics, created from JPG's with a white background. When the background was removed, most objects came out very clear; however, about 300 (mostly reds and blues) have white artifacts around the very edges. I've tried using Defringe, Remove White Matte, Refine Edges and Modify/Contract, and nothing seems to work...except manual removal using the eraser.

Has anyone got any suggestions that I might attempt that would be more automated than to manually erase 300 pics!!