Hi into3d,
You can do the following by using ScanGear MF:
-Previewing the image before scanning
-Specifying the scanning area
-Adjusting the detailed image quality
-Configuring Scan Settings in Simple Mode
- Configuring Scan Settings in Advanced Mode
Click HERE for information on configuring Scan settings in Advanced Mode which should address the issue you have described.
Click HERE for general scanning instructions.
If you continue to have difficulties, please contact our support group using the following link:
http://Canon.us/ContactLI