Why do domestic film and television dramas shoot with green screens instead of real scenes?

The process of using green screen technology to shoot and make film and television dramas is still complicated. Generally speaking, the actors need to perform in the green shed first, and the cameraman will record the actors' performances, then shoot the real scene (or make animation by computer), then use the function of "one-key keying" to separate the actors from the green screen, and finally synthesize the separated actors into real scenes or animations.

This film technology is generally used in sci-fi film and television dramas. The movie Wandering the Earth. As we all know, the development of every technology is not achieved overnight, and the green screen technology is also developed step by step. To be clear: not only domestic film and television dramas will use the green screen to shoot the driving pictures in the car, but also many American TV dramas and Hollywood movies will use this shooting method.

Reason: It's safe. Actors can concentrate on acting and recite their lines without worrying about where to go. Save money, road shooting needs to be closed, even if it is not closed, at least there must be safety cars before and after to ensure the safety of actors. High controllability. If you shoot one, you can shoot another directly. If you shoot on the road, you need to drive back to the original position to shoot again. Moreover, if the camera is directly installed in the car, it will be inconvenient for the photography director to operate the camera, and it is easiest to shoot in the shed.