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Extraction without rotoscoping
Hey all. This is my first post so firstly hi 🙂
Is there a way to extract without rotoscoping or using green screen?
Here is an example Im using, simple shot of a band playing on a beach. I then shoot the same shot minus the band (same camera location, no movement ect) (I think this would be called a plate?).
I want to add a boat on the water behind the band, can I make after effects compare the two shots, and matte out everything that is the same? Leaving the band intact.
In a way that works similar to the technology Apple uses in the new iChat. It takes a photo of your room, then you re-enter the frame and it treats the plate as a matte.
Thanks everyone!
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5 Replies
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IF you have a perfect plate, then you can use difference matte, but thanks to video compression, there’s no such thing as a perfect plate. Mocha is one step higher than roto.
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Can you post some still image examples?
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Here’s Adobe’s “everybody lives in a perfect world” description of the effect.
Hey, Dave, give me some credit. 😉
I do say this in the keying overview section:
“Noise, grain, and other subtle variations can make difference keying very difficult to use in practice.”
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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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you need to create a pixel plugger that removes single pixels that don’t belong next to a widely different luminance and ignore larger groups of them so you don’t have to mask. That way, we could automaticaly remove specks of any color.
You also need to create auto-debanding plugins that remove banding and interpolate the missing colors so we don’t have to “noise up” to hide them.
And an auto fps changer that makes timewarp changes fps easily.
And update all the plugins to 32bpc so we can use them all without fear of highlight errors.
and reverse compatibility plugin for older AE’s to import newer projects.
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Chris, you can submit feature requests using the feature-request form.
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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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