alfa mask in autodesk composite

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Old 12 December 2012   #1
alfa mask in autodesk composite

I am trying to perform a simple task: separate background from my character using alfa pass (black and white image). How do I do that?
 
Old 12 December 2012   #2
THe answer is :
Create Blend and Comp node. Plug your alfa map into masking channel. Then go to the masking tab (while Blend and Comp is selected) and select a red channel, or as I see it anything but Alfa.

Hope it will help someone!
 
Old 12 December 2012   #3
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