Operation Manual

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The Tool Chest — Color Balance
Color Balance
Color Balance
Adjusting Overall Color, Contrast, and Brightness
Adjusting Overall Color, Contrast, and Brightness
The “Color Balance” palette offers simple controls for adjust-
ing brightness, contrast, and color balance for the entire im-
age. Unlike the controls in the Curves palette, however, the
“Color Balance” palette does not allow changes that affect
only a portion of the tone range.
The controls in the “Color Balance” palette are described op-
posite. Note that when “grayscale” is selected for the color
model, the “Color Balance” palette contains only brightness
and contrast sliders.
The “Color Balance” Palette
The “Color Balance” Palette
The “Color Balance” palette can be used in both the scan window and
in image windows.
The “Apply” Button
The “Apply” Button
Changes to color balance only apply when the button at the top left
corner of the “Color Balance” palette is checked. When this button is
checked, changes to color balance will be refl ected in the image in the
active window. The box can be checked and unchecked for a quick “be-
fore-and-after” comparison to determine whether changes to settings
are having the desired effect.
Apply button
Sliders
Item Description
Brightness
The brightness slider adjusts brightness for the entire im-
age. Dragging the brightness slider in the “+” direction
brightens the image, while dragging the slider in the “–”
direction darkens the image. A value for brightness be-
tween –100 and +100 can be entered directly in the text
box to the right of the slider.
Contrast
Dragging the contrast slider in the “+” direction height-
ens the difference between high lights and shadows in
the image, increasing contrast. Dragging the slider in the
“–” di rec tion decreases the difference be tween light and
dark portions of the image, lowering contrast. A value
for contrast between –100 and +100 can be entered in
the text box to the right of the slider.
Color
balance
(Red,
Green,
Blue)
While the brightness slider adjusts brightness for the im-
age as a whole, the three color-balance controls allow
the user to adjust brightness for each color individually.
For ex am ple, dragging the red slider in the “+” direction
brightens the red portions of the image, making the im-
age as a whole more red. Dragging it in the “–” direc-
tion dims the red elements in the image, bringing out
the remaining colors. Color balance can also be set by
entering values between –100 and +100 directly in the
text boxes to the right of the sliders.