Hasta La Motion!

when you normally key, you generally have several different masks with different settings to remove the blue/green screen effectively. You can’t just use one keyer to pull an entire blue/green screen. My question is, how do you create those several different masks in Nuke? I tried it the way I thought would work but ended up only able to view one mask and not the others combined.
I am running on a PLE of Nuke and I am learning how to use the IBK keyer. I’ve researched masks on the user guide but it only talked about keylight.

Can you guys help me out? Also, sorry for all the noob questions. I normally find the answer myself but in this case, I need a professional who knows by heart. 🙂