Canon imageFORMULA DR-C225 II Document Scanner - Manual (Page 60)

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In addition, you can click the [Area] button and specify the area to be
scanned.
[Brightness] Tab
Adjust the brightness and contrast of scanned images.
In addition, you can also click [Gamma] and set the gamma correction
value for scanned images.
[Image processing] Tab
Set the processing method for scanned images.
Depending on the ISIS compatible application, the application may
have its own screen for setting scanning conditions. If the scanner
driver is opened in such an application, setting items related to the
functions provided by the scanner driver other than scanning
conditions will be displayed on the [Basic] tab.
 Gamma correction is set when the color tone of the scanned
image is different from that of the image displayed on the
monitor.
 For information on your monitor's gamma value, see the
instruction manual that came with the monitor.