40 Basic image processing
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.
Click the brightness, contrast, color-balance but-
ton to display the palette.
Brightness, contrast, and color balance palette
Is this picture too light? Adjusting brightness and contrast can
be more difficult than it looks. The image on the right looks too
bright, especially the mountains in the background.
Simply making everything darker with the brightness controls
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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