Why do you want to use a green screen for filming? It turned out to be for ...

If you have seen the footage of film shooting, you must know that most of the shots of movies, especially special effects movies, are finished in front of "green cloth", but do you know why green sets are used in film shooting?

Green screen is often used as the background in film and TV stunt production. The reason for this is very simple, which is convenient for computer processing, that is, post-editing image synthesis. When the color part of the green screen is transparent and needs a background, the main special effects come out. It makes sense to use green as the color of the curtain, because the subject is usually a character, and the rarest color in people's clothes, hair and skin color is green, so the application of green curtain should be the most extensive, and people gradually call the stunt background green curtain.

In fact, in addition to the green screen, there is also a blue screen. Both the blue screen and the green screen are background screens for shooting special effects shots. There is no essential difference between blue and green. In the past, blue was used more, but now green is used more. Actors perform in front of blue and green screens and are photographed by cameras. The picture is processed in the computer, and the blue or green background is removed and replaced with other backgrounds.

In some special scenes, such as the wild, if there are all kinds of green plants, the blue screen will be used, and many Europeans have different pupil colors from us Asians, so we will use the green screen and the blue screen to distinguish them. Of course, there will also be scenes where blue screens and green screens are used together, which is convenient for later deduction.

That's probably the reason ~ ~ ~ Make sure that the subject you shoot has no same or very close color on the background, which is convenient for changing the background. But sometimes the special need is to let some auxiliary props or clothes (even the human body) be deducted, so it is necessary to deliberately decorate the main body with background color. For example, sitting on the green box before climbing the wall in the green curtain will have the effect of sitting in the air. If you are wearing clothes without green, but your face and hands are all green, and you have something in your hand and a hat on your head, then you will become invisible after keying.

Of course, any other background color can be used. Nowadays, the post-computer technology is very powerful, but no one will do it, just like using a red background will make people's skin leak, and using a black background will make people's black hair unable to be deducted.

In fact, the green screen will gradually become a historical term. With the rapid development of science and technology, not only the color is not limited to green, but also the requirements for background color are getting lower and lower. Even if there is no curtain body, it is not difficult to dig it out for stunts (the background is the same). Look inside Forrest Gump, there are older news footage, digging out the original historical figures, plus Tom Hanks's performance image, which is also seamless.