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Chapter 18. Transparency > Knockout Groups

Knockout Groups

What are knockout groups and why do you need them? Rather than answer that question with a lot of words, let's jump to Figure 18.10. That horrible mess in the upper-left corner is supposed to be the flag of the United States of America. Are you having trouble finding the stars? That's because someone selected all the objects in the flag and simply applied the Multiply blending mode and set the opacity to 80 percent. That caused the stars and blue square to be multiplied into the red and white stripes behind them. So all the objects in the flag are multiplied and ghosted together into one mess.

Figure 18.10. Setting the Multiply blending mode and 80 percent opacity without a knockout causes the flag on the left to mix all the colors of the objects together. With a knockout group, the blending mode and opacity are applied to the entire object rather than the individual objects.



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