Sort of a cross between the SelectOColor Range command (see Chapter 8) and the Hue/Saturation adjustment, Replace Color is a great tool for swapping out one color for another. It's truly great in a production environment where, for example, a certain blouse is available in several colors. Shoot one color, and then use Replace Color to produce the additional product shots.
The Replace Color dialog box, as shown in Figure 6-13, has two separate parts: Selection and Replacement. Click with the left eyedropper, in either the preview area or in the image windows, and adjust the Fuzziness slider (how much variation counts as "selected") to make your initial selection. Use the middle eyedropper to add additional colors (or shades of your initial color), and use the right eyedropper to subtract from the selection. (Choose only variations of one color.) Then drag those Hue, Saturation, and Lightness sliders in the Replacement section of the dialog box to produce your new look.
Rather than switching eyedroppers back and forth, use the left eyedropper and the Shift key (to add) and the Option (Mac)/Alt (Windows) key (to subtract). You can also hold down the Shift key and drag through an area to select all the colors in the area. If you accidentally select some colors you don't want, release the Shift key and click once to start over.
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