Photography has a history of 100 years. According to records, the first photo in the world was taken in 1826 by the Frenchman Joseph Nissefer Nieps after repeated experiments in 13 years. He put the white wax board coated with photosensitive asphalt into a black box, fixed the black box on the window of his studio, exposed it for 8 hours, and then washed it with lavender oil to get the first photo taken by human beings. Later, he cooperated with the painter Louis Cork Mande Daguerre to continue his photographic research. 1833 After Niepce's death, Daguerre made five years of experiments and research supplements, and successively invented the silver plate method and the fixing method. Published in1August 9, 839 at the joint meeting of French Academy of Sciences and Academy of Fine Arts. It is called "Daguerre photography", also known as silver plate photography. The silver-plated copper plate is made into silver iodide with iodine vapor to make the silver-plated plate photosensitive, and then it is photographed with a lens of F 1 1 caliber, exposed in the sun for 5- 12 minutes, exposed with mercury vapor to make the latent image appear, then it is fixed with baking soda solution and washed with distilled water to obtain the photos.

The invention of photography has realized people's long-cherished wish that they can completely fix their image posture in the mirror without the painter's hands, which is both realistic and kind. Photography can also make people understand the distant exotic scenery that they could not understand before and broaden their horizons. It also brings a brand-new appreciation object to everyone's life and expands the scope of art appreciation. So photography quickly swept the world. Daguerre's photography textbook sold 29 editions in four months and was translated into six languages. New york in 1840, and London in 184 1, all had photo studios dedicated to taking portraits.

Almost at the same time as Daguerre's photography law was promulgated, a British scientist, Fox Talbert, also invented a photography method called Carlo Photography. The master he used was white paper, and he invented the process of negative and positive imaging. He took a negative film with paper coated with silver iodide as a photosensitive plate, and then printed a positive film with the negative film. The exposure time is about 8 minutes. Daguerre photography needs silver-plated copper plates, which are expensive and cannot be copied; Carlo photography can be copied, but the quality of the copied image is not good because of the rough paper fiber. At the same time, the sensitivity of the two photography methods is very low, the exposure time is long, and the camera used is extremely heavy, which brings great difficulties to the application of photography. So people constantly improve and develop photographic equipment.