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The Green Screen Handbook, 2nd Edition by Jeff Foster

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Chapter 19Complex Composites

Most of the green screen or blue screen matte extractions that you encounter will be simple and straightforward, needing only to key out a single colored background and replace it with background footage or a virtual set. However, there may be times that both green and blue are shot simultaneously to provide for different levels of matting, such as a background and foreground plane. This creates a sort of sandwich between the two planes and the subject and retains the shadows on the object. This technique also works for foreground objects such as furniture and contact items such as tables and counters that aren’t necessarily part of the background. In addition to compositing multiple screen colors, you can incorporate ...

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