Canon 3300B002 On-Screen Manual page 576

Color Settings Tab
You cannot select this setting when None or Color Matching is selected on the Color Settings tab.
The color tone may change from the source image due to the Auto Tone function. In that case,
deselect the Always Execute the Auto Tone checkbox.
Monitor Gamma
By setting the gamma value of a monitor, you can adjust the input data to the brightness
characteristics of the monitor. Adjust the value if your monitor's gamma value does not match the
default value set in ScanGear (scanner driver), and the colors of the original image are not accurately
reflected in the monitor.
Click Defaults to return to the default Monitor Gamma value (2.20).
Note
Refer to the manual of your monitor to check its gamma value. If it is not written in the manual,
contact the manufacturer.
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