Wiktionary
Etymology 1 n. (context currency English) currency unit of Armenia, worth one hundredth of an Armenian dram Etymology 2
n. The brightness in an image, as opposed to the saturation or chroma.
Wikipedia
Luma or LUMA may refer to :
-
Luma (plant), a genus of plants in the myrtle family
- Amomyrtus luma, a species of tree in the myrtle family
- Luma (moth), a genus of moths of the Crambidae family
- Luma (video), a signal used in video technology
- Luma, Iran, a village in East Azerbaijan Province, Iran
- Lumë, a village in Kukës County, Albania
- Life Unity Music Amplified, a jazz/funk band from New York
- LUMA Foundation, promotes artistic projects
- Loyola University Museum of Art, Chicago
- Unified Theory (band)
- one hundredth of an Armenian dram
- Luma (Mario), a star species from the video game Super Mario Galaxy
- one of the channels of the YUV colorspace
Luma is a genus of flowering plants in the myrtle family Myrtaceae, described as a genus in 1853. It is native to the Valdivian temperate rain forests of Chile and Argentina.
They are shrubs or small trees with evergreen foliage and smooth red or orange bark, typically reaching tall and up to in trunk diameter. The leaves are opposite, oval, 1–5 cm long and 0.5–3 cm broad, entire, glossy dark green, with a spicy scent if crushed. The flowers are 2 cm diameter with four white petals and numerous stamens; the fruit is a small purple or black berry 1 cm diameter.
The genus name derives from the Mapuche (Native American) name for a related species, Amomyrtus luma.
Species- Luma apiculata (DC.) Burret, Notizbl. - (Chilean myrtle, known in Spanish as Arrayán or Temu) - S Chile, S Argentina; naturalized in Alpine County in California
- Luma chequen (Molina) A.Gray - (Chequén or Huillipeta) - central Chile; naturalized in Peru + Bolivia
A long list of over 100 other names have been proposed in the genus, nearly all of them now regarded as members of other genera: Blepharocalyx, Eugenia, Myrceugenia, etc.
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.
Usage examples of "luma".
He dimmed the overhead lumipanel down to nothing, leaving only a small luma behind her.
Fully awake in a second, he sprang from the cot and touched the luma before the klaxon could sound again.
She heard the scuffle as he caught himself, then suddenly the luma sprang to life.
Brennen slipped her the luma and backtracked warily up into blackness.
Brightening slightly, Anakin took back the device and ran through procedures for accessing a score of miniature utensils, including knife blades, spanners, a luma, and the like.
When she rounded the second spiral, she caught the scent of something sweetly smoky, and between the dimmed luma globes saw a number of dark forms scattered around her living area.
But under the tiny orange luma his eyes gleamed, windows to the soul she loved.
Angularly elegant rented furniture lay buried under a jumble of his less vital belongings, and all the lumas burned.
His savings had been wiped out by the failure of the Luma County Savings and Loan Association, which we and everybody in town had taken to calling El Banco Busto.