Join Chris Meyer for an in-depth discussion in this video Working with luma mattes, part of After Effects Apprentice 05: Creating Transparency.
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A Couple of movies ago we took advantage of the Alpha channel of the layer to go…ahead and create transparency for a second layer underneath.…That's what track mattes do.…But in addition to borrowing the Alpha channel from the layer on top you can…also use another property of it. Its Luminance.…So let's show that example.…I'll go back to my Project panel. Open up another comp.…in this case 09-Luma Matte*starter.…It's just black and transparent to begin with.…Now I'll drag a couple more sources in.…I've got some full frame fire that I'll go ahead and add it to my comp by…selecting and typing Command or Ctrl+/ and there it fills the frame.…
And then I am going pick something that has an interesting black and…white contrast to it.…And I'll select Cloud matte.mov and also type Command or Ctrl+/ and add it as well.…And it's a bit of smoke emanating out from the side of the screen.…It does not have an alpha channel.…I am going to solo it, toggle the transparency grid and I've got nothing.…I'll go ahead and look at RGB channels, say just show me the alpha. Solid white.…
The After Effects Apprentice videos on lynda.com were created by Trish and Chris Meyer and are designed to be used on their own and as a companion to their book After Effects Apprentice. We are honored to host these tutorials in the lynda.com Online Training Library®.
- Creating masks using parametric shapes or freeform with the Pen tool
- Editing and animating masks
- Combining multiple masks
- Using one layer to define the transparency of others
- Explaining the interaction between effects, masks, and mattes
- Mastering mask animation