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34 BASIC IMAGE PROCESSING
BRIGHTNESS, CONTRAST,
AND COLOR-BALANCE PALETTE
Click the brightness, contrast, color-
balance button or select Brightness,
Contrast, Color Balance from the
image-correction option on the
correction menu to display the palette.
Drag the brightness, contrast, or color sliders, or enter specific
values in the corresponding text box to make corrections.
Dragging each slider to the right or inputting a positive number
in the text box increases the brightness, contrast, and color.
Changes will be reflected in the displayed image and in the
graph at the top of the palette. The horizontal axis of the chart
indicates the original image values and the vertical axis the new
values. Click the reset button to cancel all changes.
Clicking the auto-setting button corrects the brightness and
contrast automatically without affecting the color balance. Click
the reset button to cancel the changes.
Is this picture too light? Adjusting brightness and contrast
can be more difficult than it looks. The top image looks too
bright, especially the mountains in the background.
Simply making everything darker with the brightness
control creates a muddy image - the snow and sky are a
dull gray and there are no strong blacks.
By adding contrast to the image, the snow is brightened
while the darker trees are accentuated. The extra contrast
also gives the image the appearance of being sharper as
well as revealing fine details.
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