Action is filmed in front of a green screen, typically with a digital camera.
In post-production, filmmakers will use editing software to make the background color range (green in this case) transparent in the green screen footage, leaving only the actor and any props in the foreground of the green screen video.
In video editing, this footage can now be combined through screen compositing with existing background footage and after effects, which can be separately filmed, entirely computer-generated, or some combination of the two. Video editing, or green screen software, is essential to this stage of the process.
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