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Chapter 15. Production Bundle Techniques > Using the Color Difference Key

Using the Color Difference Key

Though a linear color key can create convincing composites, more challenging images—ones with fine detail and semi-transparent areas—require more sophisticated keying tools. While a linear key creates 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, on the other hand, is based on pixels that match the key color. The two mattes are combined to form a third, more accurate matte, referred to as the alpha matte (Figure 15.6, Figure 15.7, and Figure 15.8).

Figure 15.6. Matte Partial B is based on pixels that do match the key color.



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