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How I can subtract a blurry alpha channel from another alpha channel in the compositor?

First alpha channel
First alpha channel

Second alpha channel
Second alpha channel

final result
Desired result

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You need nothing more then a Mix node set to Subtract with a factor of one.

To replicate your bottom image, plug your first image in to the first socket on the mix node, and the blurry image into the second socket.

enter image description here

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