You can set the unit of measurement via the Units option in the Preferences dialog box. But in Version 6, there's an easier way: Just right click anywhere on the ruler to display a pop up menu of unit options and then click the unit you want to use. You can display the same pop-up menu by clicking the plus sign in the lower-left corner of the Info palette.
When you're first learning Photoshop, going with inches or picas is tempting, but experienced Photoshop artists use pixels. Because you can change the resolution of an image at any time, the only constant is pixels. An image measures a fixed number of pixels high by a fixed number of pixels wide — you can print those pixels as large or as small as you want. (To learn more about resolution, read Chapter 3.)
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Adobe Photoshop can be a complex tool only because you can do so much with it, however for in this video series, we're going to keep it as simple as possible. In fact, in this video you'll see an overview of the few tools and Adobe Photoshop features we will use. When you see this video, you'll see how you can do so much with so few features, but you'll learn how to use them in depth in the future videos.