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Using a Garbage Matte

Precise keying requires careful, time-consuming adjustments. Don't waste time and effort by allowing extraneous background or unwanted background objects to remain in the frame you're keying. Instead, use a garbage matte—a simple mask that throws out extraneous parts of the image. This way, you can concentrate your keying adjustments on the areas that need it.

To create a garbage matte:

1.
Double-click the layer you want to key to view it in a Layer window.

The image appears in a Layer window (Figure 16.4).

Figure 16.4. Open bluescreen footage in a Layer window.


2.
Using any of the mask creation tools, roughly mask out extraneous areas of the background (Figure 16.5).

Figure 16.5. Use a mask to roughly cut out extraneous areas of the image.


Make sure the subject won't move out of the masked area over the course of the layer.

If necessary, animate the masked area so that it always includes the subject as the layer plays.

3.
Apply and adjust a keying effect.


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