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Fading mask opacity

From: After Effects Apprentice 05: Creating Transparency

Video: Fading mask opacity

Now in addition to combining multiple mask shapes using these mode pop-ups as demonstrated in the previous movie, you can also use that mask opacity parameter we talked about as another way of combining multiple shapes. If you have the exercise files, open up Comp 06-Transition*starter. If you don't just go ahead and create any comp with any piece of footage, because this is a general trick you can apply to other clips. I'll select my file. Go back to say, oh, the Rectangle tool. I'm going to draw a few different mask shapes on this footage revealing different parts of the image.

Fading mask opacity

Now in addition to combining multiple mask shapes using these mode pop-ups as demonstrated in the previous movie, you can also use that mask opacity parameter we talked about as another way of combining multiple shapes. If you have the exercise files, open up Comp 06-Transition*starter. If you don't just go ahead and create any comp with any piece of footage, because this is a general trick you can apply to other clips. I'll select my file. Go back to say, oh, the Rectangle tool. I'm going to draw a few different mask shapes on this footage revealing different parts of the image.

For example may be that building. I've already got my problem where I can't see the rest of the clip, so I'm going to double click it. Go to my Layer panel with the Render turned off so I can see the rest of clip. I will go ahead and draw another mask shape around that building, draw a third mask shape around those two buildings, maybe a fourth mask shape around those guys, then finally draw one last all in composing mask that takes in the entire footage. One thing that is a little bit confusing is I've got 5 masks all with the yellow outlines. I can change them manually to different colors if I want to by clicking on the color swatches and just picking different colors in the picker.

If you find yourself doing this quite often, there is a preference you need to learn about. Just set this last color. If you want the mask to automatically cycle through colors, go to Preferences > Appearance, and there is an option called Cycle Mask Colors. If that's enabled, you'll automatically get to different color every time you create a new mask. Anyway now I've got these different shapes, plus my overall frame, I'm going to go ahead and fade them up one at the time. I'll select my layer, type M to go ahead and trope all the mask parameters, then MM to review all the parameters including mask opacity.

Let's go ahead in keyframe those, and then for this I'm going to go ahead and enable rendering. And set all their opacity down to 0 initially, scroll down my list, and finally fade it out, and start keyframing in my mask opacity. Of course the 10 frames I'll bring it up to 100%. I'll backup a couple of frames and just let them overlap. Click on Mask Opacity to select those two keyframes, Command or Ctrl+C to copy them, and now I can paste these keyframes to other masks.

Keyframes are pasted at the Current Time Indicator, so I select Opacity and paste, go to that frame, back up two frames by pressing the Page Up twice. Go to my next mask, paste, scroll to where I can see things a little bit better, jump to that keyframe, Page Up twice to get before it, Mask 4, paste, use the Keyframe Navigator to go to its second keyframes, back up two frames, and finally my last mask and paste. A little later in time. N for the end of my working area.

I'll stick this in the Comp panel. Now I've got a nice little animation where individual masks fade up over time, just by animating mask opacities. And indeed some of the animation presets under the Transition Dissolve category are based on fading up different mask shapes to go ahead and create fun animations such as this one. So that's yet another way of using masks and keyframes to create interesting looks and transitions by revealing just portions of layers.

However, this isn't the only thing you can do with masks. In the next chapter, I want to show you how to use Effects in conjunction with masks to create all sorts of other interesting looks.

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Image for After Effects Apprentice 05: Creating Transparency
After Effects Apprentice 05: Creating Transparency

38 video lessons · 12813 viewers

Chris Meyer and Trish Meyer
Author

 
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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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