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Today's practicality of green-screen compositing is demonstrated by in a self-produced video. Top panel: A frame of Crosson in full-motion video as shot in his own living room. Bottom panel: Frame in the final version, in which Crosson, impersonating, 'appears' in the White House's. Chroma key compositing, or chroma keying, is a / technique for (layering) two or streams together based on color hues ( range). The technique has been used in many fields to remove a from the subject of a photo or video – particularly the,, and industries. A color range in the foreground footage is made transparent, allowing separately filmed background footage or a static image to be inserted into the scene.
Testi dlya pomoschnika mashinista. The study showed that survival rates free of major adverse cardiac events, transient rhythm disturbances, syncopal conditions and repeated hospitalizations for the angina pectoris, in groups with “unchanged” coronary arteries and intermediate stenoses of the coro-nary arteries with FFR negative result were not significantly different in the long-term period and amounted to 100 and 95.2%, respectively (p > 0.05), which makes to consider them as professionally suitable workers and return to work. The purpose of the study was to determine the role of the complex use of FFR and IVUS to verify the diagnosis of coronary heart disease in the examination of the professional suitability of Russian Railways employees, related to safety of train traffic.
The chroma keying technique is commonly used in and post-production. This technique is also referred to as color keying, colour-separation overlay ( CSO; primarily by the ), or by various terms for specific color-related variants such as green screen, and blue screen – chroma keying can be done with backgrounds of any color that are uniform and distinct, but green and blue backgrounds are more commonly used because they differ most distinctly in hue from most. No part of the subject being filmed or photographed may duplicate the color used as the backing. It is commonly used for, wherein a is usually seen standing in front of a large map during live television, though in actuality it is a large blue or green background. When using a blue screen, different weather maps are added on the parts of the image where the color is blue.
If the news presenter wears blue clothes, his or her clothes will also be replaced with the background video. Chroma keying is also common in the entertainment industry for visual effects in and video games. Contents • • • • • • • • • • • • • • • • • • History [ ] Predecessors [ ] Prior to the introduction of and, was used to introduce elements into a scene which were not present in the initial exposure.
This was done using black draping where a green screen would be used today. First used this approach in 1898. In 1903, by used double exposure to add background scenes to windows which were black when filmed on set, using a to expose only the window areas. In order to have figures in one exposure actually move in front of a substituted background in the other, a travelling matte was needed, to occlude the correct portion of the background in each frame. In 1918 patented a travelling matte technique, again based on using a black background. This was used in many films, such as.: 4 In the 1920s, used a white backdrop to include human actors with cartoon characters and backgrounds in his.: 5 Bluescreen [ ] The blue screen method was developed in the 1930s at. At RKO, used an early version of the to create 'wipes' – where there were transitions like a windshield wiper in films such as (1933).
Credited to, a scene featuring a genie escaping from a bottle was the first use of a proper bluescreen process to create a traveling matte for (1940), which won the that year. In 1950, employee and ex- researcher began working on an travelling matte process. He also began developing bluescreen techniques: one of the first films to use them was the of the novella,, starring. Was awarded an Academy Award for his refinement of these techniques in 1964. His technique exploits the fact that most objects in real-world scenes have a color whose blue-color component is similar in intensity to their green-color component.