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Workshop

Review the questions and answers in this section to try to sharpen your Premiere alpha channel and matte compositing skills. Also, take a few moments to tackle my short quiz and the exercises.

Q&A

Q1:I want to use the QuickTime Cloud and Fire effects on a clip, but when I apply them to the clip all I see is the effect. My clip disappears. What's up?
A1: The QuickTime Cloud and Fire video effects create their own animated clip. Basically whatever clip you apply them to merely tells these effects how long to run. To use them with a clip, you need to apply them to a separate clip. It can be any clip, but to simplify things, create a color matte and apply the effects to it. That clip needs to be on a superimposing video track above the background clip on the timeline.
Q2:I tried using the difference matte but when I move the Similarity slider, my actor disappears, not the background scene. Why?
A2: The difference matte is an odd duck. It looks for differences between two images and removes them. But that's not what you want to do. You want to remove similarities. Therefore, check the Reverse Key box to do just that.


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