Canon S450 User Manual page 326

Check 2
I H
S
Check the Halftoning setting in the Quality tab of the printer driver. The
Diffusion setting smoothes uneven or streaked colors.
Windows
Open the Printer Properties dialog box.
1
Click the Advanced button in the Main tab.
2
In the Halftoning box under the Quality tab, disable Auto if it is checked and
3
enabled.
Click Diffusion and click the OK button.
4
Macintosh
When using Manual for printing, click the Details button in the Printer
1
Properties dialog box.
In the Quality panel, set Halftoning to Scatter.
2
ALFTONING SET FOR OPTIMUM PERFORMANCE
Printout Is Unsatisfactory
?
Troubleshooting 326