Things You'll Need
Instructions
Measure the inside of the picture frame intended for the picture. Mark the frame dimensions onto the mat using a pencil.
Place the mat on the cutting board and, using the ruler to keep the bevel-cutter straight, cut the mat. Check to make sure the mat fits inside the frame.
Measure to find, and then mark, the exact center of the mat.
Measure the window for the photograph and then mark that dimension on the mat, using the center marking as a reference point.
Cut out the window in the mat using the ruler and bevel cutter.
Once the window has been cut to the proper size, place the mat into the frame, followed by the photograph. Then close the back of the frame.