Canon imagePRESS C1+ Reference Manual page 422

6
7
6
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Registering/Editing Custom Paper Types
Check the location of the left edge image on the front side of the test
print.
In the above example, the centre line of the register mark is outside the left edge of the test
print (centre line of the register mark is NOT printed). Follow step 7 and 8 to adjust the left edge
of the image on the front side of the test print.
Press [Left Edge Alignment Adjustment].