Canon Color imageCLASS MF8170c Software Manual page 147

■ Resolution and Data Size
If you double the resolution, the image data will be four times greater. If the data is too
large, processing speed will slow down significantly, and you may experience
malfunctions such as lack of memory. Make sure the resolution corresponds to the
purpose of use of the image and set at the lowest level possible.
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Setting Preferences and Scanning with ScanGear MF