Canon IMAGE FORMULA DR-C125 - Manual (Page 75)

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When you do not want to scan colored lines and text
Click [Image processing] and specify the color (red, blue, or green) to
be ignored (dropped out) in the dialog box that appears, and that color
will not be scanned.
When you want to enhance the color red
Click [Image processing] and specify [Red Enhance] for [Color drop-
out] in the dialog box that appears to enhance the color red in the
document.
When you want to enhance contours in images
Click [Image processing] and adjust the edge emphasis settings in the
dialog box that appears.
When you want to make lines or characters in the
scanned images thicker
Click [Image processing] and drag the [Character Emphasis] slider in
the dialog box that appears to make lines and text in scanned images
appear thicker.