Chroma key is a system where special effects are used to turn a plain green background into any background you want. It consists of layering two images on top of each other depending on their colour hue. This method is usually used in films as it means that the actors can stay in a studio where the background can be changed instead of traveling all over the world. This is also used to remove backgrounds, a colour range in the layer on top is made transparent which shows the image behind it. This technique can be see in weather reports so that the background can move etc.
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