Thanos is a fictional supervillain appearing in American comic books published by Marvel Comics. He was created by writer-artist Jim Starlin, and made his first appearance in The Invincible Iron Man #55 (cover dated February 1973). An Eternal–Deviant warlord from the moon Titan, Thanos is regarded as one of the most powerful beings in the Marvel Universe. He has clashed with many heroes including the Avengers, the Guardians of the Galaxy, the Fantastic Four, and the X-Men. While usually portrayed as an evil-bent villain, many stories have alternatively depicted Thanos as having a twisted moral compass and thinking of his actions as justified. The character's perhaps best-known role came in the 1991 storyline The Infinity Gauntlet, the culmination of several previous story arcs, which saw him successfully assembling the six Infinity Gems into a single gauntlet and using them to kill half of the universe's population, including many of its heroes, in an effort to earn the affection of Mistress Death, the living embodiment of death in the Marvel Universe. Although these events were later undone, the storyline has remained one of the most popular published by Marvel.
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.