Select the Pen tool ( ) in the Tools panel.This is the point at which the actor has stepped fully into the frame, and it's where she moves furthest to the left. Move the current-time indicator to 2:00 in the Timeline panel.You'll create a garbage mask to limit the area you need to key. In fact, on some complex shots it is not uncommon to have multiple garbage masks isolate limbs, faces, hair, or different subjects in the scene.
There is no limit to the number of garbage masks you can have in a composition. Remember, a garbage mask is used to help solve problems, not create new ones.
If you make it too tight, your subject may move outside the mask. If the foreground subject is moving, you need to leave enough room in the garbage mask to accommodate the motion. When you create a garbage mask for a layer, it's a good idea to keep it fairly loose. You can reduce this risk and remove unwanted distractions by using a garbage mask.Īs the name implies, a garbage mask (or matte) is used to mask out the bad, or unnecessary, parts of an image.
The larger the area that must be analyzed and the larger the variation in color, the greater risk that you won't be able to remove all of the background color. When After Effects pulls a key, it looks at the entire frame of an image. Used with permission of Pearson Education, Inc. This article is excerpted from Adobe After Effects CS4 Classroom in a Book by the Adobe Creative Team.
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