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Keying, Mattes, and Masks
You can isolate specific elements of clips from the
background and combine those elements with other
clips by using keying, mattes, and masks.
This chapter covers the following:
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Ways to Layer and Isolate Elements in Clips
(p. 421)
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Using Keying to Isolate Foreground Elements
(p. 424)
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Using Mattes to Add or Modify Alpha Channels
(p. 440)
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Using Masks to Replace or Modify Alpha Channels
(p. 443)