Plustek Opticpro A320E Flatbed Scanner - Manual (Page 66)

The TWAIN Interface 31
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If you select this option, punch hole marks will be filled with the background
color of the scanned document.
Custom
If you select this option, punch hole marks will be filled with the selected color.
When you scan by the Color Mode , clicking button would allow you to choose
the desired color to remove the punch hole marks.
When you scan by the Grayscale Mode , clicking button would allow you to
choose the desired color to remove the punch hole marks.
When you scan by the B/W Mode , punch hole marks will be filled with white color
if you click button, or punch hole marks will be filled with black color if you click
button.
2.2.3.6 Scan continuously
Check this option if you want to scan multiple pages successively to the same
destination. After the document is scanned, a dialog will pop up asking you if
you will put in more paper to continue scanning, or if you want to end the scan.
You may adjust the time interval by clicking buttons.