#04A500 #greenscreen #animals #chromakeying
A green screen is a key component in a film and television production process known as “chroma keying,” in which foregrounded action is combined with separately filmed or constructed background footage. The process works by filming actors in front of large, bright green backdrops, then isolating and removing that green color range, and replacing it with a different background.
It has been utilized for many purposes in filmmaking, making characters and scenes appear to take place in far-off or perilous locations—when in fact the footage was shot on a sound stage in front of a green screen.
Chroma key compositing, or chroma keying, is a visual-effects and post-production technique for compositing (layering) two images or video streams together based on colour hues (chroma range). The technique has been used in many fields to remove a background from the subject of a photo or video – particularly the newscasting, motion picture, and video game industries. A colour 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 colour keying, colour-separation overlay (CSO), or by various terms for specific colour-related variants such as green screen or blue screen; chroma keying can be done with backgrounds of any colour that are uniform and distinct, but green and blue backgrounds are more commonly used because they differ most distinctly in hue from any human skin colour. No part of the subject being filmed or photographed may duplicate the colour used as the backing, or the part may be erroneously identified as part of the backing.
