Luma (video)

In video, luma represents the brightness in an image (the "black-and-white" or achromatic portion of the image). Luma is typically paired with chrominance. Luma represents the achromatic image, while the chroma components represent the color information. Converting R'G'B' sources (such as the output of a 3CCD camera) into luma and chroma allows for chroma subsampling: because human vision has finer spatial sensitivity to luminance ("black and white") differences than chromatic differences, video systems can store chromatic information at lower resolution, optimizing perceived detail at a particular bandwidth.

Luma versus luminance

Luma is the weighted sum of gamma-compressed R'G'B' components of a color video – the prime symbols (') denote gamma-compression. The word was proposed to prevent confusion between luma as implemented in video engineering and luminance as used in color science (i.e. as defined by CIE). Luminance is formed as a weighted sum of linear RGB components, not gamma-compressed ones. Even so, luma is erroneously called luminance.SMPTE EG 28 recommends the symbol Y' to denote luma and the symbol Y to denote luminance.

Video!

"Video!" is a song by Jeff Lynne from the soundtrack to the film Electric Dreams in 1984. It is one of two songs that Lynne and keyboard player Richard Tandy provided for the film's soundtrack. The single version is 3:26 in length, while the version included in the film is longer, at 4:18.

The chorus of "Video!" is originally taken from the unreleased Electric Light Orchestra song "Beatles Forever", which was originally to have appeared on the album, Secret Messages, when it was planned to be a double album.

Track listing

All songs written and composed by Jeff Lynne.

Charts

References

Video

Video is an electronic medium for the recording, copying, playback, broadcasting, and display of moving visual media.

Video systems vary greatly in the resolution of the display, how they are refreshed, and the rate of refreshed, and 3D video systems exist. They can also be carried on a variety of media, including radio broadcast, tapes, DVDs, computer files etc.

History

Video technology was first developed for Mechanical television systems, which were quickly replaced by cathode ray tube (CRT) television systems, but several new technologies for video display devices have since been invented. Charles Ginsburg led an Ampex research team developing one of the first practical video tape recorder (VTR). In 1951 the first video tape recorder captured live images from television cameras by converting the camera's electrical impulses and saving the information onto magnetic video tape.

Video recorders were sold for $50,000 in 1956, and videotapes cost $300 per one-hour reel. However, prices gradually dropped over the years; in 1971, Sony began selling videocassette recorder (VCR) decks and tapes to the public.

Video (song)

"Video" is the first single released by American singer-songwriter India Arie from her album Acoustic Soul. This song is her most successful one to date on the Billboard Hot 100. In 2002, "Video" was nominated for four Grammy Awards: "Record of the Year", "Song of the Year", "Best Female R&B Vocal Performance" and "Best R&B song". The song also contains a sample of "Fun" by Brick and a sample of "Top Billin'" by Audio Two.

Charts

Other appearances

The song is heard in the third episode of the first season of The Newsroom. The song is also heard in an episode of The Proud Family, when Penny is giving a make-over to one of the Gross sisters.