Help needed, please, you guys.

I’ve been trying everything I can think of for weeks, and when I export the day-for-night kiss by the lakeside, it looks like shit. The BluRay is an ugly transfer of an ugly film, and there just doesn’t seem to be enough data in the video stream to survive being modified this much. Padme’s skin looks like a 256 color display.
Are there any video-people out there who could convert the scene from the BluRay into a day-for-night effect? You probably have a better way of doing it than I do. I’m going to move on to exporting Episode III in the hopes that someone can help me out with this scene.
I appreciate you all, and don’t want to leave you all with a crappy final archival product.