So you want to see a small snippet at the full rez? Easy to do in Photoshop. Setup the page size (lets say its 8x11). Assuming you have the image properly sized (12x40), that smaller paper size in Print will show you a small area at the output size fitting within that smaller 8x11. You should be able to move the larger image around within that smaller page to see what part will print after you turn off Center Print. To move the image around the page, alter the Top and Left fields. Then print.