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Below is the alpha channel image—the white areas dene the video areas that are
composited over the background. The gray areas (which dene the shadow in this
example) dene parts of the image that are partially transparent.
This is what the nal composite looks like over a background clip.
Use a clip with an alpha channel
1 Position the playhead in the Timeline where you want to add the alpha channel clip.
2 Select the clip that has an alpha channel in the Event Browser, and choose
Edit > Connect to Primary Storyline (or press Q).
406 Chapter 12 Keyingandcompositing