Adobe 13101332 - Photoshop - Mac User Manual page 146

Adobe Photoshop Help
Using Help | Contents
About the color wheel
Because there are numerous ways to achieve similar results in color balance, it's useful to
consider the type of image you have and the effect you want to produce. If you're new to
adjusting color components, it helps to keep a diagram of the color wheel on hand. You
can use the color wheel to predict how a change in one color component affects other
colors and also how changes translate between RGB and CMYK color models.
A B
F
E D
Color wheel:
A. Green B. Yellow C. Red D. Magenta E. Blue F. Cyan
For example, you can decrease the amount of any color in an image by increasing the
amount of its opposite on the color wheel—and vice versa. Similarly, you can increase and
decrease a color by adjusting the two adjacent colors on the wheel, or even by adjusting
the two colors adjacent to its opposite.
In a CMYK image, you can decrease magenta either by decreasing the amount of magenta
or its complement (by adding cyan and yellow). You can even combine these two correc-
tions, minimizing their effect on overall lightness. In an RGB image, you can decrease
magenta by removing red and blue or by adding green. All of these adjustments result in
an overall color balance containing less magenta.
Using the Color Balance command (Photoshop)
The Color Balance command changes the overall mixture of colors in an image for gener-
alized color correction.
To use the Color Balance command:
1 Make sure the composite channel is selected in the Channels palette. This command is
available only when you're viewing the composite channel.
2 Open the Color Balance dialog box. (See
3 Select Shadows, Midtones, or Highlights to select the tonal range on which you want to
focus the changes.
4 Select Preserve Luminosity to prevent changing the luminosity values in the image
while changing the color. This option maintains the tonal balance in the image.
5 Drag a slider toward a color you want to increase in the image; drag a slider away from a
color you want to decrease in the image.
The values above the color bars show the color changes for the red, green, and blue
channels. (For Lab images, the values are for the a and b channels.) Values can range from
–100 to +100.
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"Making color adjustments" on page
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Making Color and Tonal Adjustments
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