Why do special effects use green cloth?

Why do special effects shots use green cloth?

This is background digging. Green rarely appears on characters, so it is easier to be picked out and replaced with another scene. You will find that any actor with a green background will not wear green clothes. In fact, the first one was blue.

Why must the picture before the special effects of a movie or TV series be in the green set?

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

However, sometimes a blue background cloth is used. Give two examples, such as taking photos related to the army. Soldiers wear green military uniforms and paint green camouflage patterns; In this case, you need to choose a screen with a blue background; For another example, in the future, sci-fi shots will use a lot of blue tones, so you need to consider using green as the background.

As for why only these two colors are used, the authoritative theoretical explanation is:

The basic structure of film consists of three layers: red, green and blue. Fundamentally speaking, red, green and blue can be used as the background color. Blue is frequently used for the following reasons: blue is the complementary color of our skin color, and in most scenes, the tone is similar to skin color; The reasonable choice is to use relative color and ignore the use of close color. Historically, film cameras and films are very sensitive to blue light, but from today's development, these views are not very accurate.

Green has its own advantages. 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 than blue. At the same time, cameras are usually more sensitive to the green channel, and the best resolution and picture details are generally in the green channel.

Therefore, general high-tech blockbusters with strong special effects use green background cloth!

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

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

However, sometimes a blue background cloth is used. Give two examples, such as taking photos related to the army. Soldiers wear green military uniforms and paint green camouflage patterns; In this case, you need to choose a screen with a blue background; For another example, in the future, sci-fi shots will use a lot of blue tones, so you need to consider using green as the background.

As for why only these two colors are used, the authoritative theoretical explanation is:

The basic structure of film consists of three layers: red, green and blue. Fundamentally speaking, red, green and blue can be used as the background color. Blue is frequently used for the following reasons: blue is the complementary color of our skin color, and in most scenes, the tone is similar to skin color; The reasonable choice is to use relative color and ignore the use of close color. Historically, film cameras and films are very sensitive to blue light, but from today's development, these views are not very accurate.

Green has its own advantages. 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 than blue. At the same time, cameras are usually more sensitive to the green channel, and the best resolution and picture details are generally in the green channel.

Therefore, general high-tech blockbusters with strong special effects use green background cloth!

Why do special effects shots use green cloth?

The green background is for the convenience of matting

Why do 3D special effects use blue-green background cloth?

It is convenient to key the characters in the later stage for post-processing. Because blue and green are rarely in sharp contrast with actors' clothes in movies, using these two colors as background colors will make the bedding more complete and clean.

Why do special effects use a green background?

Simply put, it's for keying. Blue and green are the least colors in most human beings, and they are almost only found in the pupil colors of some Europeans, that is, those with blond hair and blue eyes, so they choose blue and green the most, of which green is less than blue in people, so green is more than blue. Image and video keying is basically like a PS magic wand, which is to directly select this large area of color and then replace it with other background materials. If a normal China person stands in front of a piece of green cloth and has no green clothes at all, then the keying will be very clean, only keeping your whole figure. If you wear a green long-sleeved gown, you will have no body when you sculpt, only your head and hands, and those replaced background materials will replace your green clothes.

Why do special effects shots have to be shot on green cloth?

First of all, it is not necessarily green cloth, as long as the foreground contrast is large-solid color can be considered, in order to deduct the background conveniently.

If photography and movies need to remove the background, why use blue cloth or green cloth as the background? What's the good of this?

General film post-production software has a function, which can dig out what you need from the blue or green background, and then you can easily replace it with the needed background. For example, the last scene of Jackie Chan and Kim Hee Seon flying in the air in the movie Myth was made with this. The specific principle is not very clear, and it may be easy to filter.

Anyway, I have done it, and the software can easily extract images with blue-green background.

Why use "green" as the background of computer stunts?

Keying technology is widely used in the field of film and television production, and its realization method is also well known ―― when you see an actor performing in front of a green or blue background, but these backgrounds can't be seen in the final film, you use keying technology to replace the blue or green with other background pictures, which is called keying technology. Of course, "Ying Ying" is not only blue or green, as long as it is a single pure color, but the greater the contrast with the color of the actor's clothes and skin, the better, so Ying Ying is easier to achieve. If it is real-time "keying", you need a video switcher or a video capture card that supports real-time color keys. But the price is more expensive, and individuals can't afford it.

Why do you use green cloth in making movies? Not other colors of cloth.

You can use other colors of cloth. Green cloth is used because foreigners have blue eyes. If you do stunts, you will be people's eyes. Green cloth or blue cloth is usually used in China. We are Mongolians with brown eyes.