How does film production promote social development?

After the 80s of 19, dry plate photography has become very popular. Soon, more convenient movies (films) came into being in Heasman one after another, and were widely used soon. At the same time, the sensitivity of the film is greatly improved, which makes portrait photography easier and can easily go outdoors without the limitation of the studio. The progress of technology and technology has also brought about the change of photography concept. Some talented and innovative portrait photographers have injected new ideas and contents into portrait photography with their own practice, which has promoted the great development of portrait photography. Their common feature is to pay attention to the depiction of the inner world of the subject and the publicity of the photographer's own personality.