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green screen cheap

Don't know if this is the right place to ask but if someone was to paint a wall green with matte paint or wall paper could that be used as a green screen? just kinda wondering for decorating a small room with my desk in.

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Yes just make sure its well painted and then well lit, it needs to be a consistent shade of green to work optimally.

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It should be okay, but something else that matters just as much is the lighting.

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Yeah, the biggest thing is to have uniform color and good lighting. Being someone who's used green pieces of cardboard, cheap green screens, and expensive ones consistency and good lighting is all that matters.

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Be sure the wall isn't textured like stucco, a flat wall will work fine. Try to keep brush strokes consistent to prevent paint build up, or even worse, drips. Lighting is arguably more important, (3 point lighting is a great start) it's suprising how a program like Keylight in After effects will react so differently when given to seemingly similarly lit green screen backgrounds. 

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It should be okay, but something else that matters just as much is the lighting.

lol no

you can have a wall painted in rainbow colours and no matter how good your lighting is you wont be able to cut that out

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I'm a visual effects artist, though not a DP, but I think I'd chime in.

There's a lot of things that can influence how good your key is.  Your screen has to be even, no wrinkles or other textures that will add changes.  The more even your lighting is, the easier keying will be because you won't have gradients going across your screen.  You should also try not to be close to the screen, a green screen hit with light reflects green light, so it can 'splash' green light onto the subject and the parts of them turning green will cause you further headaches.  Signal noise from the camera is also a factor and that's before we get into more complicated things like color spaces and stuff.  However it also depends on what you're doing.  If you're just doing Twitch or something, you can get away with a pretty shoddy key and few will care.  Look at Pewdiepie, his keys are super ugly but he's still stupid popular.  He only needs a pretty simple and rough function out of his keys to get what he needs.  Now, if you're trying for something more cinematic, that'll be a greater challenge.

Here's an example of a 'simple' setup I did.  Most of the lights are not for the keys and they don't point at the screen.  Only the two 4 foot long Kino Flos on either side of the screen are illuminating it, they're on either side, crossing over, they use 4 foot fluorescent tubes, so they get a nice even, defused light to hit our screen.  Every other light is just to illuminate the scene itself.  Though I don't do lighting anymore, that was college, now I just sit in a computer and key footage that people make months ago with full crews.

 

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