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The terms alien abduction or abduction phenomenon describe "subjectively real memories of being taken secretly against one's will by apparently nonhuman entities and subjected to complex physical and psychological procedures". Such abductions have sometimes been classified as close encounters of the fourth kind. People claiming to have been abducted are usually called "abductees" or "experiencers". Due to a lack of objective physical evidence, most scientists and mental health professionals dismiss the phenomenon as "deception, suggestibility (fantasy-proneness, hypnotizability, false memory syndrome), personality, sleep paralysis, psychopathology, psychodynamics [and] environmental factors". Skeptic Robert Sheaffer sees similarity between the aliens depicted in early science fiction films, in particular, Invaders From Mars, and some of those reported to have actually abducted people. However, supposed alien implants have been extracted from the bodies of some abductees whose origin is still highly debated.
Chroma key compositing, or chroma keying, is a special effects / post-production technique for compositing (layering) two images or video streams together based on color hues (chroma range). The technique has been used heavily in many fields to remove a background from the subject of a photo or video – particularly the newscasting, motion picture and videogame 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. The chroma keying technique is commonly used in video production and post-production. This technique is also referred to as color keying, colour-separation overlay (CSO; primarily by the BBC), 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 human skin colors. No part of the subject being filmed or photographed may duplicate the color used as the backing.