Shooting BLUE SCREEN & GREEN SCREEN at the same time

F

FilmBoy77

Veteran
got a shoot sunday (filming one guy doing poetry) in a studio where they have a studio that has blue screen, the walls are actually painted blue and has the proper lighting already setup in the ceilings and in the room, but the floor is not....its black or conccrete. i was thinking about getting some blue construction paper and putting on the ground but i doubt i will be able to find that exact shade of blue to match their paint on the walls. a guy i know has green screen cloth (from his greenscreen setup kit) and offered to bring that to put on the ground - does it matter when filming/editing this footage that uses green and blue backgrounds together?

i'm assuming it doesnt since all you really have to do is sample the color and take it out, but just wanted to be sure in case one of you knows of any potential problems.
 
No it does not matter, you can key out the different colors separately. I have shot on green screen and used red as a second key to put different images into the scene. Specifically we shot a TV against green screen and had a red screen on it. We keyed in the back ground and then keyed in the image on the TV. Worked like a charm.
 
If you have those two colors right next to each other there'll be color spill and there'll be patches where the blue isn't quite blue and the green isn't quite green. Might not matter for your purpose but be very careful to control spill or else it won't key cleanly.
 
why would there be color spill? you mean if they are too close as in right on top of each other or something?

for my setup the wall will be blue and i plan on running green cloth or construction paper along the floor right up against the edges.
 
when lit, the color of one will likely reflect somewhat on and skew the chroma of the other. thus making it harder to key
 
Yes, when you shine a light on something it will reflect back the color of the subject to the surrounding, which is why when chroma keying it's important to get the talent a good distance away from the screen, or else you'll get green or blue spill on them that is impossible to key out later. I don't know what the shot is, but having those two colors right next to each other will definitely result in color spill once they're lit, and that's definitely going to be tough to get out. There could also be issues with shadows right near the edge, which is why when you see a floor chromakey setup the edge is always curved.
 
thanks for the insight. i went out and found some blue construction paper to place over the floor that is the very close to the blue paint on the wall at the studio so i should be good now.
 
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