September 30, 2013
Two portable green screens available for checkout by K-Staters
Equipment checkout in 213 Hale Library has added two large, portable green screens for K-Staters to check out. Each screen can be leaned against a wall or other support for videotaping, or users can check out a backdrop stand. LED lights, available from checkout, can be used to provide additional lighting.
The smaller screen, shown at right, is a 5-by-7 feet reversible green screen and blue screen. The larger green and blue screen, which is 7 feet wide by 9 feet high with a 7 feet deep floor overlay, is shown below.
These screens are used to make a background color — usually green or blue — transparent while another image layer appears in the background.
According to Wikipedia, chroma key compositing, also known as chroma keying, is "a special effects and post-production technique for compositing two images or video streams together based on color hues."
The technique can be used to remove a background from the subject of a photo or video. The newscasting, motion picture, and videogame industries frequently use this technique.
It is commonly used for weather-forecast broadcasts, where a news presenter is seen standing in front of a large map during live television newscasts. In actuality, the presenter stands in front of a large blue or green background with the map superimposed on the background in post-production.
Software to do chroma key compositing is available on computers in the Media Development Center, 213 Hale Library.