Canon S450 User Manual page 467

I Quality of Scanned Image Is Uneven
The scanned image is coarse and/or blurry.
Check
I
S THE RESOLUTION SETTING HIGH ENOUGH
Resolution determines the precision of the scanned image.
The greater the number of dots used to draw an image, the higher the
precision and the quality of the scanned image becomes. For a better
quality image, select a greater number.
The scanning speed becomes slower and the file size of the scanned
image becomes larger when you use a higher resolution.
Windows
Macintosh
Changing the Scanning Mode
Changing the Scanning Mode
Scanning Result Is Unsatisfactory
?
Scanner Problems 467