Nuke rgb/alpha question

[macool]

I am a Shake and Fusion user and have been experimenting with Nukes interface. I really like the process, however I am stuck on the most basic of basic techniques. (maybe just stuck in my old methods)

My question/problem: I want to take a read-in (has separate RED, BLUE and GREEN in the channels.) EX. I want to replace/reorder the green channel and do a ( Boolean or a Reorder) type procedure and assign the green channel to the alpha channel ……to then be used in a Color node as the mask. I’m guessing its a “shuffle command” or the sorts but after trying,,, its just not working. Can anyone pass on some tips?

PS. I understand you can also take this green mask and assign a ‘NEW layer’ for use anywhere in the comp.(color nodes ,etc.)

Can anyone help? thanx in advance!

[Dejan]

Hi Macool,

You can use the Shuffle to reorder the channels, Shuffle Copy to copy and reorder channels at the same time or Channel Copy to copy channels from one pipe to another or even in the same pipe (just plug the A and B inputs to the same node and voila).

But for what you want to do you don’t need to use neither of them, just select the green channel as a mask on the mask dropdown menu on the desired node. Case you need to tweak this channel you may add a copy channel node and copy the green channel to a new layer and channel so you can tweak it without having your end RGB result altered.

I hope it helps.

Cheers,
Diogo Girondi

[Author]

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