The settings are not appropriate for the type of document being scanned.

Do one of the following below to improve the colours in the scanned image.

• Check the Bleed Through Prevention / Remove Background Colour check box and then scan from your computer.
  
  
• Change Brightness higher and then scan from your computer.
  
  
• Change Contrast higher and then scan from your computer.
  
  
• Change Scan Type to Grey or Colour and then scan from your computer.