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Keying
Say you’ve got a godawful greenscreen. You wanna get rid of it. The shot opens with an empty frame. A second later, the character walks into frame.
You’ve got a whole second there with nothing but wrinkly greenscreen filling the frame. Is there a way to tell AE to simply remove ALL of these pixels from the shot, thus leaving behind only those that make up the character when he eventually enters the frame?
I recall a similar function in the Ultimatte plug-in. But don’t quote me on that. Can AE do this by itself?
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2 Replies
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Effects > Keying > Difference Matte
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If there are pixels in the background with identical RGB values to any pixels in the talent, the difference matte will cut holes in the talent there. So you might have to massage the levels, and maybe mask around the talent roughly (garbage matte) to make the diff matte work. Then you could use that massaged key as a track matte for the talent.
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