Small adjustments to Lightness and Saturation are usually all that's needed.
There are three sliders: Hue, Saturation, and Lightness. The Hue slider moves around the color wheel. With Master selected, you can move all the way from red (in the middle of the slider), left—through purple to blue or blue-green—or right through orange to yellow and to green.
The Saturation slider takes you from 0%, in the center, to 100% saturated (pure color, with no gray) on the right, or 100% unsaturated (no color) on the left.
The Lightness slider lets you increase or decrease the brightness of the image, from zero in the center, to +100 on the right, or -100 on the left.
As you move these sliders, watch the two spectrum strips at the bottom of the window, as well as the image itself. The upper strip represents the current status of the image, and the lower one changes according to the slider(s) you move. If you move the Hue slider to +60, for example, you can see that the reds in the picture turn quite yellow and the blues turn purple. In effect, what you are doing is skewing the color spectrum by that amount. If you move the Saturation slider to the left, you'll see the lower spectrum strip become less saturated. If you move the Lightness slider, you'll see its effects reflected in the lower spectrum strip as well.
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