Removing a solid-color background (usually green) to composite a new one behind the subject.
Chroma key, popularly called green screen, removes a uniform background color so the subject can be placed over different footage or graphics. It depends on even lighting and a wrinkle-free screen. Spill suppression and edge refinement make the composite believable.
Chroma key looks like magic on screen, but it is really a matter of physics, light, and methodical refinement in post.
Masking and compositing are the skills that let you work on one part of a frame without touching the rest — and they open up nearly every advanced visual technique in editing.
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