Monitor Gamma Setup; Monitor Gamma - Microtek ScanWizard Pro Reference Manual

Monitor Gamma Setup

The Monitor Gamma Setup command lets you compensate linear intensity of the
monitor, making them consistent between preview image and the final scanned
image.

Monitor Gamma

Check this box to enable monitor gamma value setting.
When the monitor gamma option is checked, click the up/down arrow buttons,
making gray-level of the two boxes as close as possible. Click OK to confirm.
Reference: The Preview Window 29