Erases both the centre and edge margins of the original image.
Press [Edit / Colour].
Press [Erase].
Press [Erase Centre / Border].
Press [Erase Centre / Border].
Press [Different Width].
Press the key you want to change and specify an erase width with [] and [].
Press [OK] twice.
To change the value you entered, press [] and [], and then specify a new value.