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Animating mattes

From: After Effects Apprentice 05: Creating Transparency

Video: Animating mattes

You don't have to rely on a movement inherent in your footage to create interesting animated track mattes. You can go ahead and animate or keyframe track matte elements as well. To do that, I am going to open up a new comp 10-Animated Matte*starter. It's another blank comp and I'll drag -in a couple more pieces of footage. I'll go ahead and drag in our fire that we had before, the Firestorm, center it in the background, and on top I am going to go ahead and put the thing called inkblot matte. It's this kind of an inkblot that we created for you.

Animating mattes

You don't have to rely on a movement inherent in your footage to create interesting animated track mattes. You can go ahead and animate or keyframe track matte elements as well. To do that, I am going to open up a new comp 10-Animated Matte*starter. It's another blank comp and I'll drag -in a couple more pieces of footage. I'll go ahead and drag in our fire that we had before, the Firestorm, center it in the background, and on top I am going to go ahead and put the thing called inkblot matte. It's this kind of an inkblot that we created for you.

It's much bigger than our composition. So I am going to go ahead and drag it to start, justify it down towards the bottom of the comp, and type P to reveal its Position. I'll enable keyframing for Position. Size it up the way I want it. Maybe I like it starting there. Press the N key to go to the end of my comp and drag it to its new location, maybe around here. Zero to RAM Preview and now I've got it sliding up the screen. Now that I've done that, I just need to create a normal track matte. I'll solo it.

Look at its Transparency. It does not have an alpha channel of its own. So instead I am going to need to use it as a luma matte. Turn off Solo switch and then for the layer underneath the Firestorm, which is the fill, I'll set the Track Matte pop up to Luma Matte. Now the fire fills inside the inkblot while the inkblot animates up the screen, just to create a more interesting composite. Obviously, there are variations on this theme we can create as well. But I want to just drive this on that one, you can go ahead and animate these elements individually if you want to and two, you can see why we like to take this composite and then treat it as a singular layer in another composition.

Again, it's much easy to treat as one layer than try to bring these two layers in, keep them together, and to keep their roles of transformations in sync as well.

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This video is part of

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After Effects Apprentice 05: Creating Transparency

38 video lessons · 12629 viewers

Chris Meyer and Trish Meyer
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  1. 3m 17s
    1. Overview
      1m 17s
    2. Using the exercise files
      2m 0s
  2. 28m 53s
    1. Creating basic mask shapes
      5m 7s
    2. Using advanced parametric shapes
      3m 35s
    3. Basic mask shape editing
      4m 35s
    4. Masking in the Layer panel
      1m 55s
    5. Working with mask parameters
      4m 0s
    6. Animating masks
      5m 52s
    7. Creating vignettes
      3m 49s
  3. 25m 56s
    1. Masking with the Pen tool
      6m 44s
    2. Editing a mask path
      6m 19s
    3. Using RotoBezier masks
      4m 32s
    4. Targeting masks for animation
      3m 13s
    5. Setting the first vertex point
      5m 8s
  4. 19m 7s
    1. The basics of variable-mask feathering
      7m 33s
    2. Exploring variable-mask feathering options
      5m 56s
    3. Exploring visual effects applications
      5m 38s
  5. 7m 55s
    1. Exploring mask modes
      3m 58s
    2. Fading mask opacity
      3m 57s
  6. 11m 48s
    1. Using targeted treatments
      2m 35s
    2. Filling mask shapes
      3m 8s
    3. Following mask paths
      6m 5s
  7. 13m 31s
    1. Using alpha mattes
      3m 48s
    2. Grouping track matte pairs
      3m 40s
    3. Working with luma mattes
      3m 52s
    4. Animating mattes
      2m 11s
  8. 10m 0s
    1. Using Stencil Luma
      3m 5s
    2. Using Stencil Alpha
      2m 5s
    3. Using effects with stencils
      2m 20s
    4. Stacking stencils
      2m 30s
  9. 8m 23s
    1. Quizzler challenges
      1m 18s
    2. Quizzler solution one: One word at a time
      3m 53s
    3. Quizzler solution two: Stroke drawing direction
      3m 12s
  10. 11m 18s
    1. Idea corner one: More masks and effects
      2m 50s
    2. Idea corner two: Transition effects
      3m 44s
    3. Idea corner three: Sequenced layers as mattes
      4m 44s
  11. 16m 29s
    1. Understanding track matte rendering order
      5m 48s
    2. Exploring mask interpolation
      10m 41s

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