Eyedropper Tool
In addition to using the Color Picker and Color palette to select colors, you can use the Eyedropper tool. One advantage to the Eyedropper is that you can grab colors from any open Photoshop file. After selecting the Eyedropper, you can click any part of your image and bingo!—you've got a new foreground color. You can also Option-click (Mac) or Alt-click (Windows) to change your background color. You don't have to click within the document you're currently editing; you can click any open image.
 | With Photoshop's Eyedropper tool, you can click within a document and then drag to any area of your screen to choose a color. That means ... |
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