Canon Selphy CP810 Guide D'utilisation page 20

Crop the image for the passport.
Please contact the appropriate institution for regulation details other than regarding position and size of the face.
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If you display the cropping range
[Standard] size is selected for [ID Photo], 2 lines are
displayed.
Adjust so that one line is at the top of the head and the
other line is under the chin to print a passport photo
conforming to the passport standards.
(p. 18) while the