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Lighting for Green Screening

I understand the process of greenscreening in its basic concept.
I will be attempting my first film which utilizes the green-screen effect.
In regards to lighting:

What kind of light should I use?
-Hard light so there is a deffinate contrast between charactor and background?
-Soft light?

What should I focus on in lighting?
-I know that the background needs to be consistant. Any other comments?

Thanks for your help!
You guys and awsome!!
Guardianvm
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I'd say the most important factor is to be mindful of shadows, they're problematic in keying.

A strong light placed just above the screen, aimed down, will go a long way to prevent shadows falling on the screen.

Use the softest possible lighting in the foreground.
 
Here are my semi-coherent thoughts :)

- As SPaulovich said, use a soft light for the screen. It will help hide any wrinkles you have (an inevitable problem).
- Use a low power light from behind the actor. This helps differentiate the actor from the screen. You can even get really creative and use this to help counteract "spill" if you play around with colored gels.
- You can light the actor however you wish, just make sure the screen is lit evenly! Lighting the screen separate from the actor can be difficult though if you only have a small screen. It's not impossible but it's harder since you can only get the actor so far from the screen.

Depending on the software you use you can sometimes get away with less than perfect setups. For instance, I used After Effects to do some key work in a short (darn thing is still in progress) recently and it came out quite well despite my crappy setup.
 
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