A green screen video works by filming with a green screen in the background and use that as the setting at first. Then you edit it, apparently the color green is a easy color to get rid of out of the background. Then you take the green out and you can you can put a background taht you choose as the new background. An important consideration when filming with a green screen is to make sure there are no shadows at all because then the green is really difficult to rid of. A problem when tying to eliminate the green is that if there are shadows, the green is darker in the shadow and it is harder to get rid of. After affects was easier because you just click on the green and the green was gone.
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