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![]() When an action star tumbles into a volcano, or battles a giant cockroach, or saves the crew with a daring space-walk, the chances are that chroma key or a related technology was involved in the scene.Ĭhroma key effects are often called “blue-screen” or “green-screen” effects because the foreground action is shot in front of a uniform blue or green background. ![]() Chroma key is a widely-used technique that allows foreground objects to appear in a video scene even though they were not present – and often could not have been present – when the scene was shot.
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