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What (who) is bit mask - definition
DATA TYPE
Bitmask; Mask (computers); Bit mask; Image masking; Mask bit; Signal mask; Process signal mask; Bit masking; Sigmask; Signal Mask; Wildcard Netmask; Signal masking; Image mask; Masked image; Masked imaging; Imaging mask; Mask region; Masked region
bit mask
<programming> A pattern of binary values which is combined
with some value using bitwise AND with the result that bits
in the value in positions where the mask is zero are also set
to zero. For example, if, in C, we want to test if bits 0
or 2 of x are set, we can write
int mask = 5; /* binary 101 */
if (x & mask) ...
A bit mask might also be used to set certain bits using
bitwise OR, or to invert them using bitwise exclusive OR.
(1995-05-12)
Mask (computing)
In computer science, a mask or bitmask is data that is used for bitwise operations, particularly in a bit field. Using a mask, multiple bits in a byte, nibble, word, etc.
masked
![A Korean mask worn by a [[Talchum]] performer](https://commons.wikimedia.org/wiki/Special:FilePath/A Korean Mask.jpg?width=200 "A Korean mask worn by a [[Talchum]] performer")
![Golden masks excavated from the [[Kalmakareh Cave]] in [[Lorestan]], Iran, first half of first Millennium BC, [[National Museum of Iran]]](https://commons.wikimedia.org/wiki/Special:FilePath/Ancient iranian mask.jpg?width=200 "Golden masks excavated from the [[Kalmakareh Cave]] in [[Lorestan]], Iran, first half of first Millennium BC, [[National Museum of Iran]]")
![Asaro mudman]] holding mask, Papua New Guinea](https://commons.wikimedia.org/wiki/Special:FilePath/Asaro Mud Man Kabiufa PNG.jpg?width=200 "Asaro mudman]] holding mask, Papua New Guinea")
![recognition]]](https://commons.wikimedia.org/wiki/Special:FilePath/Balaclava 3 hole black.jpg?width=200 "recognition]]")
![A [[Peking opera]] mask](https://commons.wikimedia.org/wiki/Special:FilePath/Beijing opera mask.jpg?width=200 "A [[Peking opera]] mask")
![Batak]] mask dance at a funeral feast in the [[Dutch East Indies]], 1930s](https://commons.wikimedia.org/wiki/Special:FilePath/COLLECTIE TROPENMUSEUM Batak maskerdans tijdens een dodenfeest TMnr 60045322.jpg?width=200 "Batak]] mask dance at a funeral feast in the [[Dutch East Indies]], 1930s")
![Fang mask]] used for the ''ngil'' ceremony, an inquisitorial search for sorcerers. Wood, [[Gabon]], 19th century](https://commons.wikimedia.org/wiki/Special:FilePath/Fang mask Louvre MH65-104-1.jpg?width=200 "Fang mask]] used for the ''ngil'' ceremony, an inquisitorial search for sorcerers. Wood, [[Gabon]], 19th century")
![Masks of [[Cameroon]]](https://commons.wikimedia.org/wiki/Special:FilePath/Kamerun Ekoi Aufsatzmasken Linden-Museum 45455 47707.jpg?width=200 "Masks of [[Cameroon]]")
![Anonymous]]'' wear Guy Fawkes masks while protesting against the [[Church of Scientology]], 2008, London](https://commons.wikimedia.org/wiki/Special:FilePath/London QVS April 12 2008 0010 Anons.jpg?width=200 "Anonymous]]'' wear Guy Fawkes masks while protesting against the [[Church of Scientology]], 2008, London")
![Vietnamese young people wear surgic masks after the [[COVID-19 pandemic]]](https://commons.wikimedia.org/wiki/Special:FilePath/Lễ hội La Vân.jpg?width=200 "Vietnamese young people wear surgic masks after the [[COVID-19 pandemic]]")
![Makeup simulates a half-sided mask on this man for [[Halloween]]](https://commons.wikimedia.org/wiki/Special:FilePath/Man with Halloween makeup fifty-fifty.jpg?width=200 "Makeup simulates a half-sided mask on this man for [[Halloween]]")
![The so-called '[[Mask of Agamemnon]]', a 16th-century BC mask discovered by [[Heinrich Schliemann]] in 1876 at [[Mycenae]], Greece, [[National Archaeological Museum, Athens]]](https://commons.wikimedia.org/wiki/Special:FilePath/MaskOfAgamemnon.jpg?width=200 "The so-called '[[Mask of Agamemnon]]', a 16th-century BC mask discovered by [[Heinrich Schliemann]] in 1876 at [[Mycenae]], Greece, [[National Archaeological Museum, Athens]]")
![Mask of Shame]]"](https://commons.wikimedia.org/wiki/Special:FilePath/Mask of shame.jpg?width=200 "Mask of Shame]]\"")
![Roman mosaic]], second century AD](https://commons.wikimedia.org/wiki/Special:FilePath/Mosaic of the theatrical masks - Google Art Project.jpg?width=200 "Roman mosaic]], second century AD")
![[[Funeral mask]] of [[K'inich Janaab' Pakal]] at the [[National Museum of Anthropology (Mexico)]]](https://commons.wikimedia.org/wiki/Special:FilePath/Museo Nacional de Antropología - Wiki takes Antropología 079.jpg?width=200 "[[Funeral mask]] of [[K'inich Janaab' Pakal]] at the [[National Museum of Anthropology (Mexico)]]")
![reusable filter mask]] worn by [[NYPD]] officer](https://commons.wikimedia.org/wiki/Special:FilePath/Police officer wearing half-mask respirator.jpg?width=200 "reusable filter mask]] worn by [[NYPD]] officer")
.jpg?width=200 "Greek mask")
![Three photographs of the same [[noh]] mask of a woman show how her expression appears to change with a tilting of the head of the performer - to demonstrate the effect, the mask was affixed to a wall with constant lighting and only the camera was moved](https://commons.wikimedia.org/wiki/Special:FilePath/Three pictures of the same noh 'hawk mask' showing how the expression changes with a tilting of the head.jpg?width=200 "Three photographs of the same [[noh]] mask of a woman show how her expression appears to change with a tilting of the head of the performer - to demonstrate the effect, the mask was affixed to a wall with constant lighting and only the camera was moved")
![Aztec mask of [[Xiuhtecuhtli]], c. 1500, of [[Mixtec]]-Aztec provenance](https://commons.wikimedia.org/wiki/Special:FilePath/Xiuhtecuhtli (mask).jpg?width=200 "Aztec mask of [[Xiuhtecuhtli]], c. 1500, of [[Mixtec]]-Aztec provenance")
![Mask of [[Tengu]]](https://commons.wikimedia.org/wiki/Special:FilePath/天狗の面鉄輪温泉PB060289.jpg?width=200 "Mask of [[Tengu]]")
![Shu]]](https://commons.wikimedia.org/wiki/Special:FilePath/青铜纵目面具B.jpg?width=200 "Shu]]")
![[[Kwakwaka'wakw]], Baleen Whale Mask, 19th century, [[Brooklyn Museum]]](https://commons.wikimedia.org/wiki/Special:FilePath/Kwakwaka'wakw. Baleen Whale Mask, 19th century.jpg?width=200 "[[Kwakwaka'wakw]], Baleen Whale Mask, 19th century, [[Brooklyn Museum]]")
![A [[Cherokee]] ceremonial mask made of wood](https://commons.wikimedia.org/wiki/Special:FilePath/Cherokeelongfacemask.png?width=200 "A [[Cherokee]] ceremonial mask made of wood")
![Balinese topeng]] dance masks](https://commons.wikimedia.org/wiki/Special:FilePath/Topeng Bali.jpg?width=200 "Balinese topeng]] dance masks")
![Fools Meeting or Parade, [[Meßkirch]], Germany](https://commons.wikimedia.org/wiki/Special:FilePath/Trommgesellenzunft Munderkingen Wusele Narrentreffen Meßkirch 2006.jpg?width=200 "Fools Meeting or Parade, [[Meßkirch]], Germany")
![Dance Mask (Takü), 20th century, [[Brooklyn Museum]]; These full-body masks are worn for the mourning, or ónyo ("weeping"), ceremony, a multi-day ritual held approximately a year after an individual's death](https://commons.wikimedia.org/wiki/Special:FilePath/Dance Mask (Takü), 20th century, 61.34.2.jpg?width=200 "Dance Mask (Takü), 20th century, [[Brooklyn Museum]]; These full-body masks are worn for the mourning, or ónyo (\"weeping\"), ceremony, a multi-day ritual held approximately a year after an individual's death")
![Taiwanese President [[Tsai Ing-wen]] wearing a [[surgical mask]] during the [[COVID-19 pandemic]]](https://commons.wikimedia.org/wiki/Special:FilePath/04.02 總統視察「中央流行疫情指揮中心」 49726568957 66543b616e o.jpg?width=200 "Taiwanese President [[Tsai Ing-wen]] wearing a [[surgical mask]] during the [[COVID-19 pandemic]]")
![Life mask of [[Ludwig van Beethoven]], c. 1812. The Wellcome Collection, London](https://commons.wikimedia.org/wiki/Special:FilePath/Life mask of Ludwig van Beethoven, c. 1812 CE. The Wellcome Collection, London.jpg?width=200 "Life mask of [[Ludwig van Beethoven]], c. 1812. The Wellcome Collection, London")
![Life mask of [[Abraham Lincoln]] by [[Leonard Volk]] in 1860.](https://commons.wikimedia.org/wiki/Special:FilePath/Lincoln life cast.jpg?width=200 "Life mask of [[Abraham Lincoln]] by [[Leonard Volk]] in 1860.")
.jpg?width=200 "Mask wearing customers in downtown Budapest.")
ANY FULL OR PARTIAL FACE COVERING, WHETHER CEREMONIAL, PROTECTIVE, DECORATIVE, OR USED AS DISGUISE
Masks; Masked; Masks (protective); Protective masks; Protective mask; Masks in theatre; Masks and theatre; Masks in ritual; Masks in ritual and theatre; Masks in theater and ritual; Ritual mask; SARS mask; SARS Masks; Swine flu mask; Theatre mask; Tribal mask; Flu mask; Face cover; Melanesian masks; Native American masks; SARS Mask; Face covering; Masked theatre
If someone is masked, they are wearing a mask.
Masked youths threw stones and fire-bombs.
ADJ
Wikipedia
Mask (computing)
In computer science, a mask or bitmask is data that is used for bitwise operations, particularly in a bit field. Using a mask, multiple bits in a byte, nibble, word, etc. can be set either on or off, or inverted from on to off (or vice versa) in a single bitwise operation. An additional use of masking involves predication in vector processing, where the bitmask is used to select which element operations in the vector are to be executed (mask bit is enabled) and which are not (mask bit is clear).
