Keying

In addition to fading the entire image, you can key out particular areas of an image, making them transparent. You can apply and adjust a key effect (or simply, key) in the Transparency Settings dialog box (Figure 13.12).

Figure 13.12. You can apply and adjust a key in the Transparency Settings dialog box.

You can key out parts of an image based on luminance, chrominance, an alpha channel, or a separate matte image. Although Premiere provides 15 key types, all fall into these four basic categories (Figure 13.13). You can use these key types in conjunction with a garbage matte, a method of cropping out the extraneous edges of an image. ...

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