Canon MG2500 series Online Manual page 33

Documents containing text with font size outside the range of 8 points to 40
points (at 300 dpi)
Slanted documents
Documents placed upside down or documents with text in the wrong
orientation (rotated characters)
Documents containing special fonts, effects, italics, or hand-written text
Documents with narrow line spacing
Documents with colors in the background of text
Documents containing multiple languages
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