Godzilla is a fictional monster, or kaiju, originating from a series of Japanese films. The character first appeared in the 1954 film Godzilla and became a worldwide pop culture icon, appearing in various media, including 32 films produced by Toho, four Hollywood films and numerous video games, novels, comic books and television shows. Godzilla has been dubbed the "King of the Monsters", a phrase first used in Godzilla, King of the Monsters! (1956), the Americanized version of the original film. Godzilla is an enormous, destructive, prehistoric sea monster awakened and empowered by nuclear radiation. With the nuclear bombings of Hiroshima and Nagasaki and the Lucky Dragon 5 incident still fresh in the Japanese consciousness, Godzilla was conceived as a metaphor for nuclear weapons. Others have suggested that Godzilla is a metaphor for the United States, a giant beast woken from its slumber which then takes terrible vengeance on Japan. As the film series expanded, some stories took on less serious undertones, portraying Godzilla as an antihero, or a lesser threat who defends humanity. Later films address themes including Japan's forgetfulness over its imperial past, natural disasters and the human condition.
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.