Bricks in Motion
We are a friendly filmmaking community devoted to the art of stop-motion animation using LEGO® and similar construction toys. Here, you can share your work, join our community of other brickfilmers, and participate in periodic animation contests!
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Well, I have a question for all you good greenscreeners.
How do you get the color on your greenscreen/bluescreen tagboard to be all the same?
And, a bit less importantly, I use tagboard greenscreen that is a (really) bright flourescent green. Is this a good color for it, or is a darker, mellower color a bit better? Or should I just ditch the tagboard and get a completely different kind of object for my greenscreen?
Thanks,
-BG
You should light the green screen separately so that it's consistent. If possible have it back from the set your filming so that it doesn't get shadows. This also helps prevent green being reflected back onto the set. Card is a bit shiny (bit will work), cloth is best. You need a pure colour, green, blue doesn't matter. As long as it doesn't have other colours in the mix. Just pick a colour that isn't in your scene.
This doesn't directly answer your question, but it's close enough that I don't feel like retyping it. The search function is your friend, sir. 
Edited to change link to specific post.
Last edited by Noodle (December 11, 2009 (07:50pm))
I don't get the part at the end of your post though (I really want to know how to do that) about the smoothing it out with the white index card. Sooo...how?
Basically, what you're doing is shining a light from behind the subject towards the camera. Think of a person standing in front of a well-lit window in a dark room... they're silhouetted, with a very sharp edge due to the light shining around them. Now, in the case of green screening, the effect isn't nearly that noticeable, as you use a much fainter light and the subject is lit from the front as well. But the result is the same... you're creating a sharper edge around the subject to make it easier to key.
Because the scale is so small, you really don't need much light at all. Your best move is probably going to be using a small reflector, like an index card, placed off camera to reflect some light from your other sources back towards the subject and towards the camera.
Iv'e not tried this, but there are a few people here with more than one computer. How about building your set in front of a laptop screen, then you can either have your background (laptop screen) a pure green which is already backlit, or you could have the imaged displayed on it and forget greenscreenig all together.
Ray Harryhausen used to do a similar thing, projecting film onto a screen behind his puppets and then refilming the whole scene.
a good tip for greenscreening is using multiple chroma key effects in your editing program, to make sure all green is removed
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