Canon CanoScan FB 1200S User Manual page 51

To Change the Gamma Value Settings
Click the gamma tab in the Tone adjustment dialog.
Click a pre-set value or the custom option.
To restore all settings to their default values, click this [Reset] button.
To restore the gamma setting to its default value, click this [Reset] button.
Click the [OK] button.
The changes are reflected in the image currently displayed in the preview window.
Click the appropriate radio button to select a
numerical setting.
After you click the [Custom] button, you can
drag the slidebar to adjust the setting, or you
can enter a value directly into the entry box.
Drag left or right to
change the setting.
After adjusting the gamma value, you can save the setting to a file under
a file name and load the file again whenever you want to use the settings.
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Click the up or down
arrow in the spinbox to
increase or decrease the
value or enter a number
directly into the entry box
(0.1~10.0).