Canon C5051 Quick Reference page 49

Change the Exposure and Scan
You can adjust the scanning exposure. You
can set the machine to automatically adjust
the exposure.
Specify the Document Size
You can select the original scanning size. You
can also set the machine to automatically
recognize the original size and then scan.
Changing the Scan (Zoom) Ratio
You can change the scan ratio and print. You
can select the ratio of the standard size or
specify the copy ratio by entering a number.
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