Puma is a genus in the family Felidae whose only extant species is the cougar (also known as the puma and mountain lion, among other names), and may also include several poorly known Old World fossil representatives (for example, Puma pardoides, or Owen's panther, a large, cougar-like cat of Eurasia's Pliocene). In addition to these potential Old World fossils, a few New World fossil representatives are possible, such as Puma pumoides and the two species of the so-called "American cheetah", currently classified under the genus Miracinonyx. Pumas are large, secretive cats. They are also commonly known as cougars and mountain lions, and are able to reach larger sizes than some other "big" cat individuals. Despite their large size, they are thought to be more closely related to smaller feline species. The seven subspecies of pumas all have similar characteristics, but tend to vary in color and size. Pumas are thought to be one of the most adaptable of felines on the American continents, because they are found in a variety of different habitats, unlike other various cat species.[
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.