Canon i455 Series Quick Start Manual page 44

Printing Maintenance
(1) Look at the print out. From the patterns, select the most even, least irregular
patterns and enter the number that corresponds.
Note
Less noticeable white stripes
40
If it is difficult to pick up the best pattern on Column H, pick the setting
that produces the least noticeable vertical white stripes.
(2)
Enter the numbers.
(3)
Click Send Send.
Send Send
More noticeable white stripes