Canon S450 User Manual page 263

When you finish entering numbers, save the settings.
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Make sure that the printer is turned on and letter-size plain paper is loaded;
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then click the OK button. The printer starts to print the high-resolution head
alignment pattern.
Check all the patterns in lines of (Y), from (X1) to (X6), and from (B1) to
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(B2).
For each line enter the appropriate number where you see the lines
perfectly aligned.
(Y)
Correct:
Incorrect:
When you finish entering numbers, save the settings.
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(X6) (B1)
Printer Maintenance
Using the Macintosh Printer Driver 263