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Matte Keys

Matte-based keys use an external image to define transparent areas of a clip. A typical matte is a high-contrast grayscale image (sometimes called a high-con). By default, the white areas of the matte define opaque areas of the foreground clip (sometimes called the beauty); black areas of the matte define transparent parts of the foreground clip; and gray areas define semitransparent parts of the foreground clip. The matte itself never appears in the final output; it only defines areas of transparency. Sometimes the matte perfectly matches the shape of the beauty; other times, the matte cuts a shape out of the beauty (Figures 13.46, 13.47, and 13.48).

Figure 13.46. This matte's edges perfectly match the beauty.



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