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Adjust Hue/Saturation ...
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The Hue/Saturation command lets you adjust the hue, saturation, and lightness of the entire image or of individual color components in an image. Adjusting the hue, or color, represents a move around the color wheel. Adjusting the saturation, or purity of the color, represents a move across its radius.
Hue - the values displayed in the text box reflect the number of
degrees of rotation around the wheel from the pixel's original color. A positive
value indicates clockwise rotation, a negative value indicates counterclockwise rotation.
Values can range from -180 to +180.
Saturation - the color shifts away from or toward the center of the
wheel, relative to the beginning color values of the selected pixels. Values can
range from -100 to +100.
Lightness - enter a value or drag the slider to the right to increase
the lightness or to the left to decrease it. Values can range from -100 to +100.

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