What does the film produce through the principle of visual retention?

Movies produce visual persistence through the principle of visual retention. Movies are made according to the principle of visual preservation. Visual persistence is the basis of the formation and dissemination of visual media such as animation and movies. The phenomenon of visual persistence was first used by China people. According to historical records, lanterns were the earliest application of visual persistence.

In the process of showing the film, the pictures are displayed on the screen one by one. Remove the border, the light is covered, and there is a short darkness on the screen; After each frame is displayed, the screen will be dimmed.

But again and again, the darkness is composed of the visual physiological phenomenon "visual persistence" when the human eye observes the scenery. It takes a short time for the light signal to enter the brain nerve. When the light effect ends, the vision does not disappear immediately. Residual vision is called "afterimage"; This visual phenomenon is called "visual persistence".

The principle of visual persistence in movies

According to the principle of visual persistence, film is a modern technology that uses photography (and recording) to record the images (and sounds) of external things on film, and projects the moving images (and synchronous sounds) on the screen by means of projection (sound reproduction at the same time) to express certain contents.

The phenomenon of visual persistence was first used by China people. According to historical records, lanterns were the earliest application of visual persistence. There were lanterns in Song Dynasty, which were called "riding lanterns" at that time.

Then the Frenchman Paul Rogay invented the photo disc in 1828, which is a disc with two sides crossed by ropes. One side of the plate is painted with a bird and the other side is painted with an empty cage. When the disc rotates, the bird appears in the cage, which proves that when the eye sees a series of images, it only keeps one image at a time.