Why do you use a green screen to make a movie?

The green screen is mainly used to separate the background from the foreground, which is convenient for later matting and adding computer special effects.

The analysis is as follows:

1, the film is composed of three colors: red, green and blue. It is ok to choose these three colors for general curtains. The complementary color of our skin color is blue. In some scenes, if we use blue curtains, this is contrary to the idea of using relative colors instead of close colors, but so far, these views are not so accurate.

2. So in this way, green has its own advantages. When the blue object is used as the foreground, the adaptability of green will be fully revealed. In later painting, the green background color will show obvious reflection, which is easier to operate than the blue curtain, and is more sensitive to the channel constructed by the green curtain when shooting the camera, which is conducive to creating better resolution and picture details.

3. Green is the best choice. Although blue is also very common now, people are used to the name of green screen, not to mention that green is suitable for the production of later special effects. For example, a big movie invites all foreign actors, and foreigners' pupils are generally blue. At this time, the green screen is used, and the later accuracy is improved by one grade.

4. The most common root cause of green screen is that the camera can collect as much green information as possible. There are countless movies that rely on special effects to survive now. These later Roto created the soul of a movie.

5. According to the distribution map of Bayer array in modern photography technology, green occupies the most columns, so it is convenient to delete the photographed green information with one key in the matting, thus making special effects, and the brightness of green is also considerable, which can effectively improve the efficiency of post-production.

Extended data

1, computer special effects refers to the film or TV series in the process of shooting or post-production, when there is an unusable natural environment or scene, character plot, will use special technical means and methods to get the final picture. Equivalent to stunts. Special effects technology is a concept with ever-changing extension.

2. With the development of technology, some technologies no longer belong to special effects, such as some means in color movies and editing; At the same time, some new concepts are constantly being brought into the field of special effects, such as computer animation and digital stereo technology.

Baidu Encyclopedia: Computer Special Effects