• Adobe After Effects

  Creating an alpha out of a video

  Posted by Sally Vale on September 12, 2014 at 3:20 pm

  I’m not sure how else to say that, I just know there must be an easier way to do this. Let’s say I’ve been given some logo animations over a background, as well as a file that contains the same animation but with the logo animation all in white, and the background all in black.

  I would like to get the color logo animation separated from the background by using the black and white video over it…I know there must be a simple way to do this, but for the life of me all I can figure out is to key out the black and then set the mode to “stencil alpha” but that’s not really very clean…if I set the mode to silhouette luma it will remove the black and change the logo animation to black instead of white. I guess I could just precompose that and then put that pre comp over the logo animation with background and set the mode of that layer to stencil alpha…anyone have any advice/methods you use to tackle this?

  Thanks!

  Brian Charles replied 11 years, 10 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Brian Charles

  September 12, 2014 at 3:44 pm

  Using the black and white animation as a Luma Matte should work.

  https://helpx.adobe.com/after-effects/using/alpha-channels-masks-mattes.html

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