Photo paper, also known as photosensitive printing paper, photographic paper and printing paper, is divided into three categories according to the way of outputting images, namely silver salt printing photo paper in the traditional sense, inkjet printing photo paper and printing paper. photographic paper. At present, photo paper is widely used in the market for professional image output fields such as wedding photography and children's photography; as well as advertising materials, menus, business cards, resumes, and various public fields for home office use.