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Chapter 16. Filters and Compositing > Working with Mattes

Working with Mattes

Mattes are filters that you shape to define which areas of opaque video clips are to be made transparent during compositing. For example, you could use a circular matte to isolate a clock face from its background, or you could create a matte in the shape of a keyhole to simulate peeking through a keyhole in a door.

Final Cut Express offers many types of matte filters (Figure 16.17). “Garbage mattes” are used to quickly rough out large areas of the frame. A key is a type of matte that uses a clip’s color or luminance information to determine which opaque areas will be made transparent (bluescreen effects are created with color key mattes set to make blue areas transparent). You can combine layers of different types of mattes to create very complex composite shapes.


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