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Compositing for "Night" shots [ANSWER]

Posted: Thu, 24th May 2007, 1:44am

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Goldwing Productions

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If I want to composite someone over some footage that looks like it's nighttime. Whats better, green screen or blue screen? Also, what would be the best lighting scheme? From above, the side or what?
Posted: Thu, 24th May 2007, 8:29am

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Simon K Jones

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Choice of screen colour has nothing to do with what you're compositing onto, so you don't need to worry about that. Choosing a screen colour usually comes down to two factors:

1. What colours are included on your subject? If your actors are wearing blue clothing, then use a greenscreen. If they're wearing green, use a bluescreen.

2. Digital cameras usually pick up greenscreens much better than bluescreens, due to the way they store colour information. So use a greenscreen as long as it doesn't conflict with your subject material.

In terms of lighting, that's not something we can tell you. You need to light the greenscreen shot so that it matches the lighting in the original night-time shot. Examine the way the light and shadows are in the background shot, and then match it.

You'll also want to light the greenscreen itself separately to your subjects, if at all possible.
Posted: Thu, 24th May 2007, 11:22pm

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Goldwing Productions

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alright, I see what you mean. When shooting with blue screen, is there anything you can do to enhance the camera's performance or something to do in post?
Posted: Thu, 24th May 2007, 11:35pm

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Axeman

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SuperUser

The main thing is to get enough light on the blue screen, and to keep some good distance between your subject and the screen to control color spill. Also, you might consider shooting both elements in daytime light, compositing it, then grading it to look like night time. It might make matching the lighting easier.
Posted: Fri, 25th May 2007, 12:48am

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DavidLittlefield

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You can't enhance the Camera's actually performance in post. But you can make it easier for CompositeLab to key by using "Pre-Key Filters". I think there may be some video tutorials about it. But I like just expierementing until I find what works best.