► Quick

Using the Levels command to alter shadows and highlights is extremely useful when altering a grayscale or black-and-white image. For example, if you have scanned in line art and need to clean up the background, you can use Levels to find your whitest white and your darkest dark and actually come out with fairly clean bitmapped line art. The best way to do this is to not use the sliders at all, but to select the dropper tools on the far right of the Levels dialog box. If you select the "black" dropper tool and click the darkest part of your image, this will redefine that shadow as your darkest dark or "black." Do the same with the "white" dropper tool, and this will redefine the lightest tones of your highlights

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