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back projection

photography
Also known as: rear projection

Quick Summary

Back projection, also known as background projection or process projection, is a photographic technique used in filmmaking. It involves projecting still or motion pictures onto a translucent screen. This projected image then serves as the background for live-action sequences that are filmed from the opposite side of the screen.12

This method was commonly used in studios to create the illusion of specific settings, such as passing scenery for actors in a car. While largely replaced by blue-screen technology in feature films due to limitations in sharpness and light loss, it still finds use in television production. Rear-projection setups can be more compact and produce images bright enough for viewing in daylight, making them suitable for schools and commercial displays.34

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