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Chapter 16. Production Bundle Techniques > Using the Color Difference Key

Using the Color Difference Key

Although you can use a linear color key to create convincing composites, more challenging images—ones with fine detail and semitransparent areas—require more sophisticated keying tools. In contrast to linear keys, which create a single matte based on a key color, the Color Difference key actually creates two mattes, Matte Partial A and Matte Partial B. Unlike other color keys, Matte Partial A is based on pixels that don't match the key color. Matte Partial B, in contrast, is based on pixels that do match the key color. The two mattes are combined to form a third, more accurate, matte called the alpha matte (Figure 16.6, Figure 16.7 And Figure 16.8)

Figure 16.6. Matte Partial A is based on pixels that don't match the key color.



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