Canon i-SENSYS MF3010 User Manual page 168

Register the appropriate application in the MF Toolbox.
"Using the MF Toolbox"
Scanned images are spotted or distorted.
Clean the platen glass and feeder's scanning area.
Scanned images cannot be displayed correctly if displayed smaller than the actual size, depending on the application.
Scale the images to 100 %.
Set the display colors to "High Color (16-bit or 24-bit)" or higher in [Display Properties].
A scanned image is displayed larger (or smaller) than its actual size on the computer screen.
Try one of the following to set the appropriate resolution.
Enlarge or reduce the image size in the application that you are using. In an application such as MS Paint or
Imaging, an image may be displayed larger than its actual size and cannot be scaled down.
To solve this problem, scan the image again at a different resolution. If scanned at a higher resolution, the image is
displayed larger than its actual size, and vice versa.
"Setting Resolution"
Cannot scan highlighting marks.
Start the ScanGear MF, access [Advanced Mode], and set [Color Correction] to [Color Matching].
"Using Advanced Mode"