There is a pretty drastic difference in exposure between when my footage is still and in playback. I'm in FCP 7. I converted my H264 footage (canon 7d) to ProRes 422 (LT) as my codec, with a 864x486 frame size. In order to properly color correct, is the playback exposure the one fcp will export? Or the still frame exposure?
YOu converted to ProRes, but to a frame size that FCP doesn't support for RT playback. You need to convert to ProRes FULL SIZED. Meaning 1920x1080 ProRes. Then color correct, THEN export to the frame size you need.