The Green Screen Technology

viewgreenStarred Page By viewgreen, 11th Feb 2015 | Follow this author | RSS Feed | Short URL
Posted in Wikinut>Reviews>Technology>Monitors & Projectors

Chroma key (sometimes called seine) is a technique to combine two images or frames, as a color (or a color arrangement) from one image is removed (or made transparent), so that other image that lies behind can be seen. This technique is also known as chroma key seine or the composition of the blue screen and the green screen.

What's the Green Screen?

This technology is used to broadcast weather news, where the presenter is seen standing in front of a large map. Though the actual filming is done in the studio, and the presenter stands in front of a large background of green (or blue), and weather maps are added to the green image. If at the time of filming, the presenter wearing green clothes, the clothes will also be replaced with a large map displayed video as background. This system applies also to the blue screen. Green and blue colors on the screen are used to excuse the colors is the least resemble the color of the skin.
This technology is also used in the entertainment industry, for the filming and advertising. An example is the film Avatar (2010) Hollywood film director, James Cameron. There are even commercial advertisements today that has a lot of television stations aired uses motion effects, and background image using the blue and the green screen technology.
Hollywood has long been used to manipulate the background or the background of the main object. By using green screen is the main object (usually a person) can be placed in any location without having to be there when shooting. Technically that is by eliminating the green background and replace with another picture through software on the computer.
Glancing at the Hollywood technology, the digitization wave increasingly astonishing, apparently photography also began to apply this magical technique. We can offer our model to take pictures in front of the Eifel Tower, Opera house Sydney and etc, without we are having to go to these places. We will only process it on a computer with image processing software or photograph.
The use of the green screen that is not as difficult as we imagine. The real reason we will improve efficiency in many things in photography. We do not need to buy sheets of the background screen with pictures of landscapes and other pages of colorful flower paintings.

The Green Screen History

A chroma key is a technique used in film, video and still photography to replace a portion of an image with a new image. This is most commonly used to replaced a colored background with a different setting.
The example on the right shows a shot taken against a green-screen background. The shot is then processed using editing software. The editor tells the software which color to make transparent, sets a few parameters and defines a new background image.
Chroma keys can be done in post-production or in real-time. Television programs such as news and entertainment shows use them a lot.
Advance technology for moving images (motion-pictures) known as traveling matte. This process is used until the introduction of new technology, namely digital com positing. A method in traveling matte green screen was developed in 1930 at RKO Pictures, and other studios, for the sake of special effects in the filming of "The Thief of Baghdad"[/link]/b] (1940). At RKO, Linwood Dunn uses traveling matte to create wipes, namely "the transition that resembles glass cleaner (wiper) in the car".
Awards for the development of a green screen given to , who won the Oscar for special effects in the film "The Thief of Baghdad". He created a green screen techniques and traveling matte to produce a visual effect that has never existed before in 1940. He also became the first to create special effects in Technicolor, which at that time had just developed. Here following is an excerpt of the "The Thief of Baghdad" movie uploaded by Tom Lauzon on YouTube portal in last 2012. Let's have you watched it right now:

In 1950, Warner Brothers employees and former Kodak research investigators, Arthur Widmer began working on the process of traveling matte ultra violet. He also began working on a green screen technique. Some films were first used this technique is "The Old Man and the Sea" (1958), the adaptation of the novel by Ernest Hemingway.

The Processing of

The process of making a video or image using chroma key technique is the subject to be photographed standing in front of a background with a color, or a little bit of color composition. Commonly used color is green or blue because these colors are considered the least resemble the color of the skin. The portion of the green or blue color in the background will be replaced with another image. This process is known as keying, keying out, or just key. Currently the most commonly used color green than any other color, because the receiver sensor image in the most sensitive digital video camera with a green color. This is consistent with Bayer Pattern that allocates more pixels to the green channel, mimicking the human eye sensitivity increased to green light. Therefore, the green camera channel experience less interference and capable of producing the most clear key. Additionally, less light is needed to illuminate green, green color due to the sensitivity of the image sensor is higher. The bright green color is also favored because it could be a blue background color of eyes or clothing resembles the subject. The blue color was used before the digital keying is used widely, since blue is needed for optical process, but requires more radiation than green. Nevertheless, the color blue has the advantage that in the visual spectrum, blue farther than red, which is the main color in human skin. The most important factor in the key is the separation between the foreground colors (subject) with a background color (screen). A blue screen will be used if the main subject is the green color (for example, if the subject in the form of plants), even though the camera is more sensitive to green color.
In analog television color, the color represented by the phase of the chroma sub-carrier relative to the reference oscillator. Chroma key is generated by comparing the phase of the video with the phase corresponding to the previously selected color. A portion of the video is replaced with another video in the background.
In color digital television, images are represented by three numbers (red, green, blue). Chroma key is generated with a simple numerical comparison between video with preselected color. If the color at a corresponding point on the screen (exactly, or resembles), then the video in a video that will be replaced with another background.

Why is blue or green?

The blue color is commonly used for weather maps and special effects, because this color to complement the color of human skin. The use of blue color is also related to the fact that blue film emulsion layer has the most clear crystal and therefore has good detail and minimal grain, compared with red and green emulsion. However, in the digital world, a favorite green color because digital cameras store more detail in the green channel, and the green color also need less light than blue. Green color not only has a higher value than blue light, but also in the initial digital format, the green channel is used as an example two times more often than the blue line, making more familiar green used. The actual color depending on the choice of effects artist and the need for a particular shot. In the past decade, the use of green becomes dominant in movie special effects. Green background is also preferred over the blue when filming is done in the open, because the blue sky could fit into the frame and inadvertently participated irreplaceable in the chroma key process.
Although green and blue are the colors commonly used, but in fact almost all of the colors can be used. Sometimes magenta screen is used, the value of the color magenta or fuchsia pink key referred to as magic.
Along with the improvement of image and equipment, many companies avoid confusion often experienced the weather presenter. Formerly weather presenter should watch yourself on the monitor to see the image shown behind them, now the image is projected onto a screen thin green / blue. This makes the presenter is able to accurately indicate a place and see a map without having looked at the monitor.
A newer technique is to use curtains retro reflective, in the background, along with a circle of LED (Light Emitting Diode) light around the camera lens. In this way, there should be no light to illuminate the background, in addition to the LED that just needs a little power and place, not like the big stage lights. In addition, LED's also do not require rigging (where installation of lights). Progress was made possible by the discovery of a practical blue LED's in the 1990s. The same thing applies to emerald green LED's.
There is also a form of color keying using invisible light spectrum humans, called Thermo-key. Thermo Key uses infrared as its key color, which cannot be replaced with a background image post-processing. Please watching a video of "Superman Returns: Flying" in the studio with the green screen back ground here:

Conclusions and the Data Credits*

Green screen technology is the basis of the effects seen in everything from the latest Hollywood films to the weather forecast. The idea is simple. If you shoot video with a single colored background (blue or green is often used) pinnacle studio allows you to make a color transparent - replacing it with any other video clip, graphic or still images. By use the green screen, simple to put on something or someone in every shots. You can transport yourself to the moon, appear in your favorite movie, or make a presentation along with all the relevant facts and figures. And also you can use a single color, flat object as a screen, but the ultimate pinnacle studio is unique in the world as the only editing video editing package to come with a free green screen. Or if you want to try out the software that specifically deals with the selection of a green screen, can be downloaded at here!. And more information go and find it here!.

Thank you very much for your stopping by to read this page. :)

~"The Green Screen" - ©2015| viewgreen for the Wikinut - Unique Contents.


All Images are taking from: Jagatreview & Obengplus
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author avatar Carol Roach
11th Feb 2015 (#)

very well done, however, could you please make smaller paragraphs and leave a space between them. I have trouble reading when everything is squished together

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author avatar viewgreen
12th Feb 2015 (#)

I thank you very much for the approval to publish this page sir. cc:~ (Steve Kinsman)


Well, maybe because I was in the chase by deadline time so did not have time to organize this writing better... Lol! :) At least thank you very much for your advice and supporting. I also thank you for stopping here with a great comment madam. :)

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author avatar Utah Jay
11th Feb 2015 (#)

They had a green screen at the children's park, it was so fun to play with. The kids would put the blanket in such a way that only their heads could be seen on screen...Everyone was laughing...Good job Viewgreen.

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author avatar viewgreen
12th Feb 2015 (#)

Yes, Absolutely sir. I think, probably due to the children's game that finally the idea that technology is often to used in the film making was created.. Thank you sir for a great comment here. :)

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author avatar Retired
11th Feb 2015 (#)

Wow, excellent share! I

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author avatar viewgreen
12th Feb 2015 (#)

Thank you very much for the stopping by. and I appreciate it. :)

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author avatar M G Singh
12th Feb 2015 (#)

Most informative post

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author avatar viewgreen
12th Feb 2015 (#)

Thank you very much sir, and surely yours too are more informative. :)

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author avatar Shamarie
12th Feb 2015 (#)

Yes, the green screen is amazing and fun! Excellent article, Viewgreen, and congrats on another star page! Well deserved!!!

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author avatar viewgreen
12th Feb 2015 (#)

Of course my friend Shamarie! I thank you very much for the stopping by with great comment here my friend. have a nice day to you. :)

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author avatar Colekdikit
13th Feb 2015 (#)

Nice job friend. thanks.

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author avatar heshal mase
15th Feb 2015 (#)

nice post thanks for share.

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author avatar Ptrikha
18th Feb 2015 (#)

Well described and congratulations on being the author of the day.

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