What is the principle of photography?

The light pas through that lens is focuse on a CCD or CMOS, which converts the light into an electrical signal, which is processed by a processor, recorded in a memory of a camera, proces by a computer, electro-optical converted by a display, or printed by a printer to form an image.

The specific process: the light enters the camera from the lens, and the CCD performs color filtering and photosensitive (photoelectric conversion) to "decompose" the photographed object into pixels according to a certain arrangement. These pixels are transmitted to the "analog-to-digital converter" in the form of analog image signals, converted into digital signals, transmitted to the image processor, processed into real images, and then compressed and stored in the storage medium.