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Lower thirds are most commonly found in television news production, although they also appear in documentaries and even have begun to make appearances in amateur videos thanks to home-video non-linear editing systems (NLE).
In its simplest form, a lower third can just be text overlying the video. Frequently this text is white with a drop shadow to make the words easier to read. A lower third can also contain graphical elements such as boxes, images or shading. Some lower thirds have animated backgrounds and text.
Lower thirds can be created using basic home-video editing software or professional-level equipment. This equipment makes use of video's alpha channel to determine what parts of the graphic or text should be transparent, allowing the video in the background to show through.
Lower thirds are also often known as "CG" or captions, and sometimes chyrons in North America, due to the popularity of Chyron Corporation's Chiron I character generator, an early digital solution developed in the 1970s for rendering lower thirds. Other common terms include superbars (or simply supers) (US), name straps and astons (after Aston Broadcast Systems) (UK).
Video with lower thirds is known as a "program as broadcast" or as "dirty"; video without lower thirds is known as a "clean feed" or as "textless". For international distribution, programs often include "textless elements" on the master tape – these are all the shots to which lower thirds (and other digital on-screen graphics) have been applied, placed end-to-end so a clean master can be created if necessary.
Lower thirds are usually arranged in tiers, or lines:
- One-tier lower thirds — Usually used to identify a story that is being shown, or to show a presenter's name.
- Two-tier lower thirds — Used most often to identify a person on screen. Often the person's name will appear on the first line, with his or her place of residence or a description below it. Two-tier lower thirds may also be used as "locators" to identify where a story is taking place.
- Three-tier lower thirds — These lower thirds add more information. Commonly the first tier is used to tell when the video was shot, if it was not shot the day the newscast is airing.
In addition to information pertinent to the currently-showing video, the lower thirds has increasingly become saturated with specialized, dedicated graphic elements, such as news tickers, digital on-screen graphics, time and date, stock quotes and/or sports scores, with specialty channels (such as those for news, business, weather and sports) accruing such elements in order to keep the perpetual interests of viewers.
Notable mistakes and bloopers
- On February 4, 2002, MSNBC's lower-third display misspelled Niger Innis's first name with a superfluous "g," resulting in his name being displayed as "Nigger Innis." Innis, the national spokesperson for the Congress On Racial Equality, is an African-American.
- During the Space Shuttle Columbia disaster in 2003, MSNBC reported the shuttle was travelling 18 times the speed of light upon re-entry.
- During 2005's Hurricane Katrina, a Sky News lower third identified "Bush: One of the worst disasters to hit the U.S."
- On May 11, 2007, CNN International inadvertently displayed a chyron reading "Bush Resigns" over a story about the resignation of United Kingdom Prime Minister Tony Blair.
- On November 27, 2007, CNN's Spanish service showed a caption reading "Who killed him?" over an image of Venezuelan president Hugo Chavez, who was alive at the time.
- On July 24, 2013, a BBC World News caption identified Australia's Kevin Rudd as Prime Minister of Canada
- See this usage in The New York Times blogs, for instance, .
- "Bush: Worst Disaster to Hit U.S.". About.com. 2013-07-19. Retrieved 2013-07-24.
- Wishful Thinking? CNN Int'l Chyron Error, "Bush Resigns" at BoingBoing.Com. Accessed December 5, 2008.
- "CNN regrets Chavez caption gaffe". BBC News. 2007-11-28. Retrieved 2013-07-24.
- "BBC World News refers to Kevin Rudd as Canadian prime minister". The Australian. 2013-07-24. Retrieved 2013-07-24.