Canon PIXMA MG6821 User Manual - Page 468

On the Color Adjustment tab, select OK to close the Manual Color Adjustment dialog box. On the Main tab, select OK, and then execute printing. The printer then prints a pattern in which the intensity/contrast that you set is the center value. 6. Adjusting the intensity/contrast Look at the print results and select the image that you like best. Then enter the intensity/contrast numbers indicated at the bottom of that image into the Intensity and Contrast fields on the Color Adjustment tab. Clear the Print a pattern for color adjustment check box, and click OK. 468