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Working with Rulers

Carpenters know that precise measurements are essential to making things fit, so they have a rule: Measure Twice, Cut Once. In keeping with the idea that precise measurements are essential, Photoshop gives you several measuring systems-among them are the ruler bars. Ruler bars are located on the top and left sides of the active document window, and serve several purposes. They let you measure the width and height of the active image, they let you place guides on the screen to control placement of other image elements, and they create markers that follow your cursor as you move. As you can see, Rulers serve a very important role. Ruler guides help you correctly align image design elements. As a matter of fact, if you're not working on a flat glass or LCD monitor, the curvature of the monitor can give you a false impression of the vertical and horizontal. By using guides you have access to precise alignment systems. To use the Ruler guides, the ruler bars must first be visible.


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