The
Color Balance command changes the overall mixture of colors in an
image for generalized color correction.
Make sure the composite channel is selected in
the Channels palette. This command is available only when you’re
viewing the composite channel.
Do one of the following:
Choose Image > Adjustments >
Color Balance.
Choose Layer > New Adjustment Layer >
Color Balance. Click OK in the New Layer dialog box.
Select Shadows, Midtones, or Highlights to select the
tonal range in which you want to focus the changes.
(Optional) 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.
Drag a slider toward a color that you want to increase
in the image; drag a slider away from a color that 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.