Canon CanoScan D646U User Manual page 47

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 the default settings, click this button.
To restore the gamma default settings, click this 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.
The Tone Adjustment settings can be
saved in a file and reloaded for later use.
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S T E P 3
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).