Canon FB630U User Manual page 30

Hint
Scanning the same image in the three different scan modes produces different
file sizes. By size, Black & White mode requires the least disk space, followed in
order by the Grayscale mode and the Color mode. Before scanning, check the
data volume indicator on the control panel.
The numerator indicates the amount of disk
space required for the scanned image while
the denominator indicates the amount of
disk space available. When the required
space exceeds the available space, the scan
button is unavailable.
To Set the Scan Mode
Select the Scan Mode box on the control panel and choose the desired scan
mode.
Scan Mode is displayed in the pull-down menu.
Select the scan mode that you want.
Selecting the box opens the
pull-down menu.
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