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How many Colors!? A four-color book cover design is normally not four flat colors. The term “four-color book printing” refers to black and the three process colors of CYMK:
The next time you notice a blurry picture in a color newspaper, take a closer look and you'll see how the process works. The picture is blurry because the press was "out of register" (perhaps the cyan ink didn't drop precisely on top of the yellow ink). Sometimes the register is so bad you can actually see the different color dots.