I would want to put a mask on a picture with the background transparent. I currently have it in the node editor. I have a mask input node and I add it to my image with a mix node. But I can only set color(like green, red, brown...) with the mix node but I would want a transparent background.
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$\begingroup$ did you try "Set Alpha" node $\endgroup$– ChebhouMay 8 '15 at 21:00
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$\begingroup$ how would you do that? $\endgroup$– jonapapMay 8 '15 at 21:18
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You can use the Set Alpha node found in : Add➝Converter➝Set Alpha use the mask node output as an Alpha input for the Set Alpha node :
