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Creating transparency using keying


    You can make parts of a footage file transparent by keying out a color or luminance value. Keying makes it easy to key objects moving across a consistent background color or objects too complex to mask easily. When you key out a value, all pixels that have similar colors or luminance values become transparent. This technique is often called bluescreening, although you do not have to use blue; you can use any solid color for a background. For information on using keying effects, see Using keying effects.

    Note: To get more powerful keying capabilities, use the advanced keying effects available in the Adobe After Effects Production Bundle.