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iPhoto ’11: The Macintosh iLife Guide to using iPhoto with OS X Lion and iCloud by Jim Heid, Michael E. Cohen, Dennis R. Cohen

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How It Works

Under the hood, the Definition slider makes localized contrast adjustments throughout the image to subtly improve detail. When you add definition, iPhoto increases the contrast in mid-tone areas of the image—those not-too-bright and not-too-dark areas that lurk in the middle area of the histogram. Adding definition has the effect of making mid-tone areas appear sharper and removing some of the “cloudiness” that digital images can have.

But who cares? The point to remember is this: applying the Definition adjustment to your best shots can often make them even better.

Use sparingly. A little adjustment goes a long way. Drag the sliders too far, and you may up with an artificial-looking photo that ...

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