Canon 4.1 User Manual page 48

To Adjust the Brightness and Contrast
In the Tone Adjustment dialog click the brightness/contrast tab.
Adjust the brightness/contrast settings by dragging the slidebars,
changing the value with the spinbox buttons, or entering the value
directly into the entry box.
To restore all the default settings, click this button.
To restore the brightness/contrast default settings, click this button.
Click the [OK] button.
The settings will be reflected in the image currently displayed in the preview
window.
S T E P
Drag the slidebar left or right to adjust the
brightness setting.
You can also click the up or down arrow in the
spinbox to raise or lower its value or enter a
number directly into the entry box (-127~+127).
Drag the slidebar left or right to adjust the
Contrast setting.
The Tone Adjustment settings can be saved in a
file and reloaded for later use.
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