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Lesson 9. Keying

Lesson 9. Keying

Lesson Files APTS_Motion > Lessons > Lesson09
Time This lesson takes approximately 45 minutes to complete.
Goals Learn how to generate a key in Motion
  Refine a key with the parameters in Primatte RT
  Apply a Matte Choker
  Create a garbage matte using the masking tools
  Apply a Zoom Blur effect


So far we've been quite happily layering objects on top of each other in our composites. That's because for the most part the objects we've been compositing have had alpha channels that tell Motion which parts of an object should look opaque and which parts should be transparent. A problem arises when you want to composite an image without an alpha channel. In such situations you need to create one. One way to do this is by “pulling a key.”


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