Keying and channel masks

Hi VFX Talk peeps!

I’m working on a green screen key and have done various mattes that I have put into channels for hair, objects in the scene that have more green spill etc.

(I’m working in Nuke 6.)

Now I am wondering why only Primatte is the only big keyer that offers the option to bring in nuke channels as masks?

Both Keylight and IBK don’t have a mask option, though keylight does have an alpha mask option its not as poweful as using a nuke channel so the question is why not?:confused::confused::confused:

Peace
-cr0ss

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