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The Photoshop® CS Book for Digital Photographers by Scott Kelby

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Resizing Digital-Camera Photos

If you’re used to resizing scans, you’ll find that resizing images from digital cameras is a bit different, primarily because scanners create high-resolution scans (usually 300 ppi or more), but the default setting for digital cameras usually produces an image that is large in physical dimensions, but lower in ppi (usually 72 ppi). The trick is to decrease the size of your digital-camera image (and increase its resolution) without losing any of its quality. Here’s the trick.

Step One.
Open the digital-camera image that you want to resize. Press Command-R (PC: Control-R) to make Photoshop’s rulers visible. As you can see from the rulers, the photo is just a little more than 23.5″ wide by just over 18.347″ high. ...

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