What is the principle of film? Introduce the film by photography and recording.

1. Movies use photography (and recording) to record the images (and sounds) of external things on film, and through projection (sound reproduction at the same time), the moving images are projected on the screen (synchronized with the sounds) by electricity to express certain contents.

2. Film is a visual art, which simulates the experience of exchanging ideas, stories, perceptions, feelings, beauty or atmosphere through recorded or programmed moving images and other sensory stimuli. The word film is the abbreviation of cinematography, which is usually used to refer to film production and film industry, and the resulting art forms.

3. Film is a modern art that uses modern scientific and technological achievements as tools and materials to create touching, vivid and concrete images in the time and space of the screen to reflect social life by creating visual images and combining lenses.

4. Movies can accurately "restore" the real world and "show" the virtual world, giving people a sense of reality and closeness, just like being there. This feature of movies can satisfy people's desire to feel life more broadly and truly.

The frame rate of movies is generally 24 frames per second. With the improvement of technology, movies with 48 or even 60 frames per second will soon appear.