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Chapter 5. Advanced Altering Photos > Cleaning Up Previously Printed Materials

Cleaning Up Previously Printed Materials

The archiving department stops by with your Editor and together they decide that all the magazine advertisements ever created should be on the Web. But you don't have all the electronic files that created the ads. You do have the existing advertisements that have been printed in other magazines.

The problem is that when an image is printed, it's made up of thousands of little colored dots—most often cyan, magenta, yellow, and black. There might be some extra colors in there as well. When you scan previously printed material, you get what's called a moiré pattern. The little rosettes that make up the colors on the printed page are invisible to the eye from correct reading distance, but when scanned, all you see are those little patterns. There are a couple ways to get rid of the moirés.


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