History: -Alpha compositing
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Example image demonstrating hue and alpha channels
Alpha compositing is the process of combining an image with a background to create the appearance of partial transparency. It is often useful to render image elements in separate passes, and then combine the resulting multiple 2D images into a single, final image in a process called compositing. For example, compositing is used extensively when combining computer rendered image elements with live footage.
See Also
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{WIKIPEDIA()/}