The Hue/Saturation dialog box is a very powerful tool with a slightly misleading name. Sure, it lets you adjust the hue (colors in the image) and the saturation (the intensity of the colors), but it also gives you control over the lightness.
First, look at the controls in the Hue/Saturation dialog box (see Figure 5.10). The first pop-up Edit menu lets you select either a single color to adjust or the Master setting, which adjusts all the colors in the image or selection at once. For now, work with the Master setting. Check Preview so that you can see the effects of your changes in the picture you're working on.
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