Canon PIXMA MG4200 Series On-Screen Manual page 760

Important
If you double the resolution, the data size of the scanned image quadruples. If the file is too large, the
processing speed will slow down significantly, and you will experience inconvenience such as lack of
memory. Set the minimum required resolution according to the use of the image.
Note
When you will be printing the scanned image by enlarging it, scan by setting a higher resolution than
the recommended one above.
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