I have imported good quality footage into premier pro which was working really well up until I started playing around with colours. The video then started lagging so I did some research on how to stop that and I ending up rendering what I had put together so far. This then caused the video to begin to blur and become extremely pixelated. I don't have time to start all over again as this is for an important school assignment. Is there anything I can do to get the quality back to the way it was?