An optical scanning system (10) for scanning images from film transparencies or reflective copy, and for reproducing images onto film or photosensitive paper to prepare films, printing plates and the like. A platen assembly (16) having two platens (34, 36), each platen having an image area, is rotatable between two positions to selectively locate one of the platens in an orientation for scanning an image area of such platen. A scanner (44, 46) traces scan lines (60) across the image area in a first direction (y) as a gantry assembly (18) transports the scanner over the image area in a second direction (x). To load film, the scanner is automatically moved out of the platen's path of rotation, a sheet of film is automatically raised to the platen which by vacuum force holds the film to the platen, and the platen is rotated to bring the film into a position to be scanned.