I am very curious to learn how I might be able to shoot my actors in front of a greenscreen, and then insert them into a night timelapse shot.
To give an example, how can I take one or two actors, maybe just standing there, or perhaps a couple kissing or something, and comp them onto a moving 24p timelapse of stars moving across a night sky like this plate below (minus the sunrise on the mountain peak) which I would shoot on my DLSR or RED at 4K...
What would be ideal for me is if I could bring along, say, a 12x12 greenscreen and shoot my actors on location, in the very places where these timelapse plates would have been shot, and somehow correctly light and expose them to fit perfectly onto a composite with the timelapse plate. This, rather than trying to match wardrobe, hair, etc, a month later in a greenscreen studio in LA.
It is more or less difficult to composite against a dark or even black night vs against a glowing sunset or regular blue sky?
Even with all the technology George Lucas has at ILM, I have to say that the final sunset shot on Tatooine in Sith did not look convincing at all to me.
It seems like this type of greenscreen shooting might be tough, because if you are outside on location and it's dark, and you are lighting a green screen behind your actors, wouldn't you be getting some "backlighting" around their edges and hair that would seem unnatural for a shot supposedly taken against a night sky?