Erases the center margin of the original image.
Press [Edit / Colour].
Press [Erase].
Press [Erase Centre / Border].
Press [Erase Centre].
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.