Adjusting Contrast And Brightness - Canon MultiPASS C50 Software User's Manual

To automatically adjust the image tone:
On the ScanGear toolbar or on the Tone tab, click the Auto Tone button.
.

Adjusting Contrast and Brightness

For a colour image, you can adjust its contrast and brightness in one or
more colour channels. For a greyscale image, you can adjust its contrast
and brightness only in the master colour channel.
Chapter 6 Scanning 6-21