Canon i 850 - Manual (Page 48)

Description of Print Settings 48
Printer Driver Functions (Macintosh)
(4) Print Mode
Select the option in accordance with the document type and printing purpose.
(5) Details...
Allows you to manually set the print quality and color settings in the
Detailed Setting
Dialog Box .
(6) Grayscale Printing
Select to print a grayscale version of a color document.