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Setting Hue Shift
Shifting the hue changes the colors in the image.
You can use hue shift to compensate for material that is too hot or too cool,
or simply to correct undesired tones present in the images. Note that in a
monochrome or very low saturation image, a hue shift produces no results,
since there is no hue to begin with.
Since you are working with a circle, a hue shift value of 360 returns to the
original color or image. A hue shift of 180 is equivalent to a negative, as the
colors are at their complements. The default for the Hue parameter is 0.
To apply a hue shift:
➤ Select the range that you want to modify, then do one of the following:
■ Set the Hue Shift field by either dragging inside the field or typing in
a value.
■ Place your mouse on the outer ring of the color wheel and drag in a
circular motion.
Setting Saturation
Saturation indicates how concentrated the color is: a saturated color has very
little gray, while a desaturated one is dampened with more gray. For example,
a pastel blue has a very low saturation level, while a blue screen is heavily
saturated. A scarlet red has a high saturation, while a pale pink has a low one.
To set the saturation:
➤ Set the Saturation field by either dragging inside the field or typing in a
value.
Setting Contrast
Contrast indicates the difference between the light and dark colors in an
image. A high-contrast image is mostly black and white, with very little gray.
A low-contrast image is very flat, foggy, and composed mostly of midtones.
634 | Chapter 26 Color Correction