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This might refer to a technique called "blue screen", "chroma blue" or "chroma keying". Chroma key uses a pure colour background, normally blue or green, with a subject in front of the background. The subject will not have any of the background colour - A news presenter would not be allowed to wear a blue tie if he is in front of a blue screen for example. The signal is processed in the chroma keyer to change the blue or green signal to black, so the only visible image will be the subject itself. This is the "key" signal Next, the key signal is overlaid on a background. If the key signal is black, the background is visible, otherwise the key signal is visible. This is a simplified explanation - apologies to the broadcast staff who have a great deal of expertise in the science and art of setting up good chroma keys. This is often used in news broadcasts, with the presenters sitting in front of a blue screen. The rest of the news studio is a "virtual set", generated by computer graphics systems. The result is that the same studio can be used for lunchtime news, with its own distinctive set and then for evening news, with an entirely different set. Sometimes, it is possible to identify that the technique is being used, if there is a pale blue or green fringe around a presenter. The better the lighting and the more care the tech staff take, the less apparent it is. By the way, if the news presenter insisted on wearing his favourite blue tie with a blue background, the effeect would be to make the tie transparent, so you would see the background through the middle of the presenter. It makes for interesting and whacky effects on a music channel, but less impressive for the more serious broadcasters.
What else can I help you with?
What is the term for a picture that is black and white with one color added?
The term for a picture that is black and white with one color added is called a "spot color" image.
What is a picture within a picture called?
Its called a picture within a picture The term is inset. A picture that has a smaller copy of itself within the picture, with the copy having an even smaller copy, that continues to (theoretically) infinity, is called a Droste Effect or recursive picture.
What is the term for a picture with eyes looking at you from wherever you look at it?
It is called the cross-focal point.
What is meant by the term electronic eavesdropping?
placing a high tech device in a location to have access to what goes on there (also called "bugging")
Why are blue laws called blue?
The term "blue laws" comes from the 18th-century usage of "blue" to mean strict or austere. These laws were regulations that enforced religious observance and restricted certain activities on Sundays, leading to the term "blue laws."
What is the medical term for The process of recording a picture of blood vessels?
The process of recording a picture of an artery is called an arteriography. This is sometimes done in the medical testing process to locate weak places or blockages.
What does the tech term IT mean?
Information Technology
What does picture in a picture mean?
when there is a picture in a picture, we use the term, "inscribing" This is because, there is a picture, inside another picture.
What is the short term goals of information technology?
tech
What is the term for people who are sent out to tech their religion?
missionaries
What is the medical term of black and blue mark?
The medical term for bruise is contusion. More than one bruise or a large area of bruises is called contusions. Contusions start off as black and blue, but as they heal, they change to other colors.
Why are grey dogs called blue?
Grey dogs are sometimes referred to as "blue" because the term "blue" is used in the dog breeding world to describe a specific shade of grey that has a bluish tint to it.
