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Really bad greenscreening help
Hey all,
Im looking for a bit of help with my awful greenscreen work lol. See, me and a group of about 5 people are making a small movie (about 5 minutes) for my year 11 english assessment task. We got allocated a genre, and got sci-fi. So We decided since we cant get the backgrounds we want, we’ll just film against a green screen and composti the backgrounds in. Now, us being absolute noobs to this filmed it all just before the school holdays and sisnt leave any time to refilm if there was a problem with the footage.
So of course there is a problem with the footage. We lit the green screen. We lit it a little too much and one of the corners is white. It all loked so good on the camera (oh yeh its a JVC Everio like one of the hard disk ones) but when I key out the green (Im using AE and Keylight) there is a white corner.
What I want to know is, is there a way to get rid of the white without converting it to a filmstrip and rotoscoping the whole thing? I really dont want to rotoscope it (cause ill have to roto 3000+ frames) or should I just not bother, and refilm it again 2 days before its due and do it all in a couple of nights?please dont get up me im a noob to all this….
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5 Replies
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What you need to do is create a garbage mask.
A garbage mask is a mask that loosly follows the actors or objects in a shot, thus eliminating unwanted footage in a greenscreen shot.
So, use a loose mask around your footage and animate it as well. When you are satisfied with the mask, then use keylight to pull your key.
Check out some of the tutorials on this site. I know I saw a garbage mask tutorial around here somewhere.
peace,
Michael -
OK thanks for that. Im downloading a video tut on this now. I hope it turns out OK. Now, all I have to do is find some backgrounds of the lava planet from episode III. Anyone know here to get these lol
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With an uneven lit screen, I’ll often apply Difference Matte. You have to get a shot of the screen without anyone in front of it and make it a freeze frame on another layer.
You can turn the results of that into an automated garbage matte by applying a couple Simple Chokers (positive, then negative) until you have something that surrounds your foregrounds, then apply your Keylight onto that.
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Well I tried the garbage matte thing, it worked, but not as good as I hoped. I found a tut on how to use Auto Trace and that is working brilliantly. I have gotten some great composits using it. Although is is still one or 2 shots where it thinks the white section is part of the actor, but I dont think its going to kill anyone if I hav a shot or two with a bit of white. It might look a bit silly (since one of the shots is a parody of the mustafar duel and everything is just about black.
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Also, you guys know how with the mustafar duel theres always smoke and pieces of ash/lava constantly falling from the sky, is there a tutorial on how to do this somewhere? Eith in after effects or Maya?
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