Canon Image Formula P-215 - Manual (Page 60)

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When you want to enhance the color red
Specify [Red Enhance] for [Color drop-out] on the [Image processing]
tab to enhance the color red in the document.
When you want to enhance contours in images
Adjust the edge emphasis setting on the [Image processing] tab.
When you want to make lines or characters in the
scanned images thicker
Drag the slider for [Character Emphasis] on the [Image processing]
tab to make the lines and characters that appear in the scanned image
thicker.
When you want to enhance text that is difficult to read
because of factors such as the background of the
scanned document
Select [Advanced Text Enhancement II] in the color mode setting on
the [Basic] tab. The background behind the text is removed or
processed so that the text is emphasized for better readability.