The gamma setting defines midtone brightness. You can adjust the gamma based on a single combined gamma reading (the View Single Gamma Only option). Or you can adjust the midtones individually for red, green, and blue. The second method produces a more accurate setting, so you will use that method here.
For the Gamma option in the Adobe Gamma utility, deselect the View Single Gamma Only option. Drag the slider under each box until the shape in the center blends in with the background as much as possible. It may help to squint or move back from the monitor.
Make adjustments carefully and in small increments; imprecise adjustments can result in a color cast not visible until you print.
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