Why do you want to put green cloth in the background when making special effects movies?

The reason why the background is green is that fluorescent green is easier to separate from the foreground in the computer system, and at the same time, this color is brighter and it is not easy to produce black edges. Besides green, there is also a blue background.

In recent years, the green screen is used more in stunt shooting, because the fluorescent green used in the green screen is easier to separate from the foreground in the computer system, and at the same time, this color is brighter and it is not easy to produce black edges. In addition, the green pixels in the CMOS Bayer image array of most cameras are twice as many as red and blue, with the strongest signal, the least noise and the most brightness information. Blue noise is at most the darkest, so blue screen is generally not recommended.

Extended data:

Blue screen is generally used in Asia, and green screen is generally used in Europe. Mainly because most Europeans' eyes are blue, if you use a blue screen, the eyes of the late actors will be easily cut off.

Keying is to absorb a certain color in the picture as a transparent color, and cut it out of the picture, thus exposing the background and forming a superposition synthesis of two layers of pictures. In this way, the characters photographed indoors are superimposed with various scenery after being keyed, forming a magical artistic effect.

References:

Baidu encyclopedia-green scenery