Hello! I am working on an animated border. I have a composite shot with the matte source on the bottom (a red rectangle) and a rotating plane with a color gradient (pink and black) on top. When it is supposed to be totally black, I can see the matte color along the edges. Pic is zoomed in but when zoomed out to its original size, you can still see a faint line. I have tried making the border bigger and scaling it down but that doesn't help. I have also tried Spill Remover and Matte Cleaner and I don't see a difference. Is there anything to help the edges?