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When you want to enhance red
Specify [Red Enhance] in the color dropout settings on the [Image
processing] tab, and red will be enhanced in the scanned image.
Click [Image processing], and when a dialog box opens, specify [Red
Enhance] for [Color drop-out]. This will enhance the red-color part of
the document.
When you want to enhance contours in images
Adjust the edge emphasis setting on the [Image processing] tab.
Click [Image processing] and adjust the edge emphasis settings in the
dialog box which appears.