Things You'll Need
Instructions
Place the mat face down on a safe cutting surface.
Measure the mat opening using a ruler and a pencil. To do this, measure your photograph and subtract ¼ of an inch to your measurements on all sides. This will allow your mat to overlap the photograph by ¼ inch. So if you had a photograph that was 5 by 7 inches, you would need an opening of 4.5 by 6.5 inches
Subtract this measurement from the size of your mat. If your mat is 8 by 10 inches, you would get a total of 3.5 in all directions.
Divide this number in half to determine how much of a border you will have all the way around your picture. In the above case, you would get a border of 1.75 inches.
Measure your border on the back of the mat, drawing it in carefully with your pencil.
Cut out the opening straight down with a sharp utility knife, using your ruler as a guide to give you a straight edge.
Place the photograph face down onto the mat and secure with framing or archival tape. Frame the photo.