Canon IMAGEFORMULA DR-2020U - Manual (Page 52)

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Configuring the Scanner Settings
Configure the scanning conditions based on the desired scanning
results.
When you want to delete blank pages in two-sided
documents
Set [Scanning Side] to [Skip blank page] in the [Basic] tab to delete
scanned blank pages in a document.
Hint
When [Skip blank page] is selected, the [Setting] button is enabled,
and you can adjust the density level for judging whether pages are
blank.
When you do not want to scan colored lines and
characters
Specify the color to omit (red, blue, or green) from the [Color drop-out]
drop-down list in the [Image processing] tab, and the specified color is
not scanned.
When you want to enhance a particular color
Specify the color to enhance (red, blue, or green) from the [Color
drop-out] drop-down list in the [Image processing] tab.