Canon PIXMA MG2525 All-in-One Inkjet Printer (Black) - Manual (Page 289)

Quality
When you select Custom in Print Quality , you can use the slider bar to adjust the print
quality level.
Grayscale Printing
Set grayscale printing. Grayscale printing refers to the function of converting your document
to grayscale data in the printer to print it in monochrome.
When you check the check box, both monochrome and color documents will be printed in
monochrome. When printing a color document, be sure to uncheck the check box.
Related Features
Setting the Print Quality Level (Custom)
Printing a Color Document in Monochrome
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