The blackbuck (Antilope cervicapra), also known as the Indian antelope, is an antelope found in India, Nepal and Pakistan. The blackbuck is the sole extant member of the genus Antilope. The species was described and given its binomial name by Swedish zoologist Carl Linnaeus in 1758. Two subspecies are recognized. It stands up to 74 to 84 cm (29 to 33 in) high at the shoulder. Males weigh 20–57 kilograms (44–126 lb), an average of 38 kilograms (84 lb). Females are lighter, weighing 20–33 kilograms (44–73 lb) or 27 kilograms (60 lb) on an average. The long, ringed horns, 35–75 centimetres (14–30 in) long, are generally present only on males, though females may develop horns as well. The white fur on the chin and around the eyes is in sharp contrast with the black stripes on the face. The coat of males shows two-tone colouration: while the upper parts and outsides of the legs are dark brown to black, the underparts and the insides of the legs are all white. On the other hand, females and juveniles are yellowish fawn to tan.
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.