I have two layers L1 and L2. I want to make layer L3 to copy L1 and L2 every time when they modifed. L3 may contains some filtering and every time when I modify L1 or L2 my L3 must recopy modified layer and reassign it's filtering to new image. How to make it in photoshop CS 5?
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You can't really do this with straight layers.
But you can do this with a smart object.