Our frames and mats are listed for the exact picture size, with 1/2 inch display cut off. Picture Frame example: 16x24 frame will fit a 16x24 picture exactly, but will display 15.5x23.5. Matted Frame example: 13x19-11x17 matted frame will fit a 13x19 picture and display 10.5x16.5. An 11x17 picture can also be taped to the back of the mat. Matting example: 22x28-18x24 mat opening is 17.5x23.5. The mat can be used inside a 22x28 frame.