Canon MP980 series On-Screen Manual page 646

Color Settings Tab
Note
When previewing or scanning images with plain backgrounds, 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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