Framing: How to Attach a Photo to a Mat
- 1). Lay your photograph face up on a table with the top of the image hanging 1 or 2 inches over the edge of the table.
- 2). Lay the mat, face up, on top of the photograph and center the mat over the image.
- 3). Apply 2 small pieces (less than an inch long) of hinging tape to the top of the photograph and mat so half of the tape is on the back of the photograph and half is on the back of the mat.
- 4). Lift the mat up with the image hanging down. Place the backing board behind it and the glass or acrylic in front of it, and then insert into the picture frame.
Source...