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Green screen markers
I’ve got a project coming up that will require some green screen work. No problem, theoretically, anyway 🙂
Because there will be come camera movement in 3d space around the actors, I plan to use registration marks on the green. This is where the theory breaks down for me: how do you get rid of the markers when the composite/move-match is done?
It seems like you’d get the movement done, then go back and key out the markers separately, but I don’t want to get knee deep in that part of the process and be incorrect.
The same question would go for markers placed in the environment. I’m thinking for example of the shot in Jurassic Park when Grant and the kids are running through a field filled with tennis balls for markers. How does one key those out?
Thanks!
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5 Replies
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Bill, you may want to try masking out your markers instead of keying them. This sounds like the kind of shot where you’ll want to to more than a one-click key, but instead use a couple mattes to control what’s going on – i.e. garbage matte, core matte, and edge matte.
So, key the characters & mask the markers – That’s my recommendation.
Carl Larsen
TelescopeMediaGroup.net
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The very info I was looking for, and what I had in the back of my head. Thanks for the confirmation, and for the quick reply!
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OH! I forgot I had a second question. Ooops.
What about markers in the environment, e.g. a tennis ball used to note movement in the live action environment for reference by an animator adding an element to a scene?
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At that point, it’s really a shot by shot case. But some of your options include tracking it and painting it out with a clean frame, or tracking it and covering it with an additional element (like adding another tree to the scene).
Sounds like you have something fun in the works.
Carl Larsen
TelescopeMediaGroup.net
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If I remember the discussions after Jurassic Park hit the screens, the tennis balls were needed for two purposes. they gave the actors something to deal with on the set and they provided the animators with reference targets. The ball markers were individually and painstakingly tracked, frame by frame for x-y-z values, and each of these separate tracks was used to conduct a single member of the flock.
that kind of stuff just makes my head hurt and I’m glad someone else has to think it up and make it work.
bogiesan
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