I'm color correcting some footage in Apple Color. In most of the locations I shot a gray card, hoping to use Color's Auto Balance to get me 90% there in the Primary grade before moving on to Secondaries. However I didn't always entirely fill the frame with my gray card, and some of the background colors seem to be throwing off auto balance enough to be noticeable. Is there a way to have Apple Color balance off a specified region (zero it in on my card) rather than the full frame? I can do it manually if not, but obviously this would be easer. Thanks!