Canon IMAGEFORMULA DR-2020U - Manual (Page 53)

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When you want to enhance contours in images
Adjust the [Edge emphasis] setting in the [Image processing] tab.
When you want to eliminate black borders around
scanned images
Select the [Border Removal] check box in the [Image processing] tab.
The black borders that surround scanned images are removed.
When you want to reverse the black and white in scanned
images (TWAIN driver only)
Select the [Reverse Image] check box in the [Image processing] tab.
The scanned images are output with black and white colors reversed.
Hint
The ISIS driver does not have a function for reversing black and
white.