Film is a direct transliteration of "FILM" in English. The common name for film in the platemaking and output center is actually a transparent film. There is a medicine film on one side of the film. Pay attention to protect this side to avoid scratching, and there is no medicine film on the other. The printed film is divided into four colors (CMYK) and spot colors. The four color films are stacked to form a complete color image, and the spot color films are usually made into black plates for printing suppliers to make PS plates.