Canon BJC-S820D User Manual page 142

In the printer driver settings, select a higher print quality setting.
Windows
1
Open the Printer Properties dialog box.
2
On the Main tab, click High for the Print Quality setting.
Macintosh
1
Open the Print dialog box.
2
For Print Mode, select Manual and then click Details.
3
Click the Quality icon and then drag the Print Quality slide bar to Fine.
Print Quality is Poor or Contains Errors
Troubleshooting
142