other parts of the foreground video/image should not contain this color.the foreground footage should have a solid color background (although you can use any solid color, green or blue backgrounds are preferable),.For better effect, the following simple rules must be fulfilled:
Photos or videos shooted against a green background.Using such software you can easily create a slideshow out of your photos with unusual landscape scenes in the background or insert an animated character into you video that will move over the video image during the file playback. The Chroma Key effect available in green screen video editing software allows to make the overlaid image backdrop transparent so that a layer underneath becomes visible. Green screen is often used when shooting videos or photos in order to later combine two images/videos replacing the green background with another one.
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