Here's an old trick: apply just a half-pixel blur to the image and see if it helps. You might need a 1-pixel blur depending on the resolution of the image. With the proper camera speed, you wouldn't even notice it.
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA
You might also want to describe the format you are working in, and what resolution the stills are in the first place. Could be that you could save a lot of repair work and improve your quality by changing your work flow in a simple way.