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donaldm49566304
donaldm49566304
Participant
March 19, 2020
Question

using single RGB channel as black and white mask

  • March 19, 2020
  • 1 reply
  • 578 views

How can I remove the blue channel from a some footage to use it as a black and white mask? So easy in Photoshop but I can't figure it out or find a tutorial for it in after effects.

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1 reply

R
Community Expert
Rick GerardCommunity Expert
Community Expert
March 19, 2020

There are several ways to use the blue channel for a matte. Probably the easiest is to use Set Channels. 

Here I have turned off all of the color channels and am setting the Alpha Chanel of the layer to Blue.

 

You can even point to another layer.  Let us know if that does not do it for you. There are several other ways to manipulate channels in After Effects.

donaldm49566304
donaldm49566304Author
Participant
March 19, 2020

Wow, a reply from an Adobe Legend!

 

Thanks, that works well.

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