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Screen

Screen is the same as the Merge node, only with operation set to screen by default. It layers images together using the screen compositing algorithm: A+B-AB if A or B 1, otherwise max(A,B). In other words, If A or B is less than or equal to 1, the screen algorithm is used, otherwise max is chosen. Screen resembles plus. It can be useful for combining mattes and adding laser beams.

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