Keying, roto and tracking
Remove a green screen in After Effects with Keylight, Key Cleaner and Advanced Spill Suppressor. I'd start with the included three-effect preset, because it sets the effect order and ties the spill colour to Keylight's sample. The guide then checks the alpha and cleans up the spill.
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How to remove a green screen in After Effects
Apply the included Keylight preset, sample the green, preserve hair in the matte and clear spill. Add garbage and hold-out masks where the shot needs them, then place the new background below.
