Garbage Mattes With Primatte

[marien]

Hi,
as a new Nuke user I couldn't find a way to use garbage masks in conjunction with the primatte keyer. I'm used to Shake where you have several inputs for garbage and holdout mattes in the primatte node. How is this treated in Nuke ? I suppose you have to use the channels in some way, but I could not figure out how it works. Maybe some of you can help me.

thanks
frank

[user_deleted]

put your garbage matyte into the fg's alpha (or any other channel) and activate it as the fourth channel at the top of Primatte's control panel ("foreground and mask").