Seeing Double in Photoshop

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Apart from the space taken up by Photoshop's tools and palettes, the usual tendency is to fill the rest of your screen with the biggest view you can of the image you are working on. That makes sense since you want to see what you are doing. But sometimes you are better off having two copies of the same image on screen rather than just one big one in order to avoid problems. Sometimes "seeing double" can be a good thing....

More... (http://www.earthboundlight.com/phototips/photoshop-duplicate-new-window.html)