Canon MG6400 series Online Manual page 186

Note
If it is difficult to pick the best pattern, pick the setting that produces the least
noticeable horizontal stripes.
(A) Least noticeable horizontal stripes
(B) Most noticeable horizontal stripes
If it is difficult to pick the best pattern, pick the setting that produces the least
noticeable horizontal streaks.
(A) Least noticeable horizontal streaks
(B) Most noticeable horizontal streaks
Note
After head alignment is completed, you can print and check the current setting. To do
so, click the Print Head Alignment icon and when the message is displayed, click Print
Alignment Value.
186