You would need to create it in Photoshop from scratch. Put down you're background and then make two frames with the 4:3 aspect ratio. Then take the magic gradient and copy it. Name one Input A and the other Input B, center those behind the two frames and resize them so that the height fits the frames, but cut off the parts that extend past the sides of the frames. If you plan on angling the frames, then make sure that you are working in at least a 16-bit workspace. Also make the canvas size in Photoshop 3840 x 2160.