Erases the center margin of the original image.
Press [Edit / Stamp].
Press [Erase].
Press [Erase Center / Border].
Press [Erase Center].
Specify the erase width with [] and [].
Pressing [] or [] changes the width in increments of 1 mm (0.1 inches). Pressing and holding down the relevant key changes the width in increments of 10 mm (1 inch).
Press [OK] twice.