Green is the rarest color in human body. At the same time, cameras are generally more sensitive to the green channel, and the best resolution and picture details are generally in the green channel. So movies with good special effects use green curtains.
Blue is the complement of our skin color. In most scenes, the hue is similar to our skin color. In order to improve contrast, you can use blue curtains.
Green has more advantages than blue. When there are blue objects in the foreground, it has obvious adaptability when drawing the mask part. In the process of painting mask, green has obvious reflection ratio, which is easier to be recognized than blue.
On the other hand, Europeans have blue eyes. If you use a blue screen, it is easy to gouge out the actor's eyes later.
Extended data:
Green scenery: The green scenery is green curtains.
The blue screen or green screen is often used as the background in film stunt production, so that the image can be cut and synthesized later.
Because blue is the complementary color of human skin, it should be the easiest to pick out the image with a blue screen as the background. In recent years, the green screen is more used for stunt shooting. Perhaps the fluorescent green used in the green screen is easier to separate from the foreground in the computer system, which is brighter and less prone to black edges.
Example:
For example, "Forrest Gump", with old news footage, dug up the original historical figures, coupled with Tom Hanks's modern performance image, is also done seamlessly.
The scene of the Monkey King walking in the TV series The Journey to the West was shot in front of the blue screen, and it was changed into the background of the sky after processing.
References:
Encyclopedia of green curtains