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During the Three Kingdoms period of ancient China, there was constant warfare occurring in the Central Plain of China. Northerners began to enter into Fujian region, causing the region to incorporate parts of northern Chinese dialects. However, the massive migration of northern Han Chinese into Fujian region mainly occ...
In 677 (during the reign of Emperor Gaozong), Chen Zheng (陳政), together with his son Chen Yuanguang (陳元光), led a military expedition to pacify the rebellion in Fujian. They settled in Zhangzhou and brought the Middle Chinese phonology of northern China during the 7th century into Zhangzhou; In 885, (during the reign of...
Xiamen dialect, sometimes known as Amoy, is the main dialect spoken in the Chinese city of Xiamen and its surrounding regions of Tong'an and Xiang'an, both of which are now included in the Greater Xiamen area. This dialect developed in the late Ming dynasty when Xiamen was increasingly taking over Quanzhou's position a...
Hokkien has one of the most diverse phoneme inventories among Chinese varieties, with more consonants than Standard Mandarin or Cantonese. Vowels are more-or-less similar to that of Standard Mandarin. Hokkien varieties retain many pronunciations that are no longer found in other Chinese varieties. These include the ret...
In general, Hokkien dialects have 5 to 7 phonemic tones. According to the traditional Chinese system, however, there are 7 to 9 "tones",[citation needed] more correctly termed tone classes since two of them are non-phonemic "entering tones" (see the discussion on Chinese tone). Tone sandhi is extensive. There are minor...
The Amoy dialect (Xiamen) is a hybrid of the Quanzhou and Zhangzhou dialects. Taiwanese is also a hybrid of these two dialects. Taiwanese in northern Taiwan tends to be based on the Quanzhou variety, whereas the Taiwanese spoken in southern Taiwan tends to be based on Zhangzhou speech. There are minor variations in pro...
Hokkien dialects are analytic; in a sentence, the arrangement of words is important to its meaning. A basic sentence follows the subject–verb–object pattern (i.e. a subject is followed by a verb then by an object), though this order is often violated because Hokkien dialects are topic-prominent. Unlike synthetic langua...
The existence of literary and colloquial readings (文白異讀), called tha̍k-im (讀音), is a prominent feature of some Hokkien dialects and indeed in many Sinitic varieties in the south. The bulk of literary readings (文讀, bûn-tha̍k), based on pronunciations of the vernacular during the Tang Dynasty, are mainly used in formal p...
The pronounced divergence between literary and colloquial pronunciations found in Hokkien dialects is attributed to the presence of several strata in the Min lexicon. The earliest, colloquial stratum is traced to the Han dynasty (206 BCE - 220 CE); the second colloquial one comes from the period of the Southern and Nor...
Quite a few words from the variety of Old Chinese spoken in the state of Wu (where the ancestral language of Min and Wu dialect families originated and which was likely influenced by the Chinese spoken in the state of Chu which itself was not founded by Chinese speakers),[citation needed] and later words from Middle Ch...
Hokkien originated from Quanzhou. After the Opium War in 1842, Xiamen (Amoy) became one of the major treaty ports to be opened for trade with the outside world. From mid-19th century onwards, Xiamen slowly developed to become the political and economical center of the Hokkien-speaking region in China. This caused Amoy ...
In the 1990s, marked by the liberalization of language development and mother tongue movement in Taiwan, Taiwanese Hokkien had undergone a fast pace in its development. In 1993, Taiwan became the first region in the world to implement the teaching of Taiwanese Hokkien in Taiwanese schools. In 2001, the local Taiwanese ...
Hokkien dialects are typically written using Chinese characters (漢字, Hàn-jī). However, the written script was and remains adapted to the literary form, which is based on classical Chinese, not the vernacular and spoken form. Furthermore, the character inventory used for Mandarin (standard written Chinese) does not corr...
While most Hokkien morphemes have standard designated characters, they are not always etymological or phono-semantic. Similar-sounding, similar-meaning or rare characters are commonly borrowed or substituted to represent a particular morpheme. Examples include "beautiful" (美 bí is the literary form), whose vernacular m...
Hokkien, especially Taiwanese, is sometimes written in the Latin script using one of several alphabets. Of these the most popular is Pe̍h-ōe-jī (traditional Chinese: 白話字; simplified Chinese: 白话字; pinyin: Báihuàzì). POJ was developed first by Presbyterian missionaries in China and later by the indigenous Presbyterian Ch...
Min Nan texts, all Hokkien, can be dated back to the 16th century. One example is the Doctrina Christiana en letra y lengua china, presumably written after 1587 by the Spanish Dominicans in the Philippines. Another is a Ming Dynasty script of a play called Romance of the Lychee Mirror (1566), supposedly the earliest So...
All Latin characters required by Pe̍h-ōe-jī can be represented using Unicode (or the corresponding ISO/IEC 10646: Universal Character Set), using precomposed or combining (diacritics) characters. Prior to June 2004, the vowel akin to but more open than o, written with a dot above right, was not encoded. The usual worka...
In 2002, the Taiwan Solidarity Union, a party with about 10% of the Legislative Yuan seats at the time, suggested making Taiwanese a second official language. This proposal encountered strong opposition not only from Mainlander groups but also from Hakka and Taiwanese aboriginal groups who felt that it would slight the...
Professional wrestling (colloquially abbreviated to pro wrestling or wrestling) is an athletic form of entertainment based on a portrayal of a combat sport. Taking the form of live events held by touring promotions, it portrays a unique style of combat based on a combination of adopted styles, which include classical w...
The content including match outcomes is choreographed and the combative actions and reactions are executed in special manners designed to both protect from, yet simulate, pain. These facts were once kept highly secret, but they are now openly declared as the truth. By and large, the true nature of the content is ignore...
Originating as a popular form of entertainment in 19th-century Europe and later as a sideshow exhibition in North American traveling carnivals and vaudeville halls, professional wrestling grew into a standalone genre of entertainment with many diverse variations in cultures around the globe, and is now considered a mul...
Although professional wrestling started out as petty acts in sideshows, traveling circuses and carnivals, today it is a billion-dollar industry. Revenue is drawn from live event ticket sales, network television broadcasts, pay-per-view broadcasts, personal appearances by performers, branded merchandise and home video. ...
Due to its persistent cultural presence and to its novelty within the performing arts, wrestling constitutes a recurring topic in both academia and the media. Several documentaries have been produced looking at professional wrestling, most notably, Beyond the Mat directed by Barry W. Blaustein, and Wrestling with Shado...
Currently, the largest professional wrestling company worldwide is the United States-based WWE, which bought out many smaller regional companies in the late 20th century, as well as its primary US competitors WCW and Extreme Championship Wrestling (ECW) in early 2001. Other prominent professional wrestling companies wo...
Gradually, the predetermined nature of professional wrestling became an open secret, as prominent figures in the wrestling business (including WWE owner Vince McMahon) began to publicly admit that wrestling was entertainment, not competition. This public reveal has garnered mixed reactions from the wrestling community,...
Professional wrestling shows can be considered a form of theatre in the round, with the ring, ringside area, and entryway comprising a thrust stage. However, there is a much more limited concept of a fourth wall than in most theatric performances. The audience is recognized and acknowledged by the performers as spectat...
Most wrestling matches last for a set number of falls, with the first side to achieve the majority number of pinfalls, submissions, or countouts being the winner. Historically, matches were wrestled to 3 falls ("best 2 out of 3") or 5 falls ("best 3 out of 5"). The standard for modern matches is one fall. However, even...
In matches with multiple competitors, an elimination system may be used. Any wrestler who has a fall scored against them is forced out of the match, and the match continues until only one remains. However, it is much more common when more than two wrestlers are involved to simply go one fall, with the one scoring the f...
Many modern specialty matches have been devised, with unique winning conditions. The most common of these is the ladder match. In the basic ladder match, the wrestlers or teams of wrestlers must climb a ladder to obtain a prize that is hoisted above the ring. The key to winning this match is that the wrestler or team o...
Due to the legitimate role that referees play in wrestling of serving as liaison between the bookers backstage and the wrestlers in the ring (the role of being a final arbitrator is merely kayfabe), the referee is present, even in matches that do not at first glance appear to require a referee (such as a ladder match, ...
Special guest referees may be used from time to time; by virtue of their celebrity status, they are often scripted to dispense with the appearance of neutrality and use their influence to unfairly influence the outcome of the match for added dramatic impact. Face special referees will often fight back against hostile h...
Matches are held within a wrestling ring, an elevated square canvas mat with posts on each corner. A cloth apron hangs over the edges of the ring. Three horizontal ropes or cables surround the ring, suspended with turnbuckles which are connected to the posts. For safety, the ropes are padded at the turnbuckles and cush...
In some team matches, only one entrant from each team may be designated as the "legal" or "active" wrestler at any given moment. Two wrestlers must make physical contact (typically palm-to-palm) in order to transfer this legal status. This is known as a "tag", with the participants "tagging out" and "tagging in". Typic...
Sometimes, poly-sided matches that pit every one for themselves will incorporate tagging rules. Outside of kayfabe, this is done to give wrestlers a break from the action (as these matches tend to go on for long periods of time), and to make the action in the ring easier to choreograph. One of the most mainstream examp...
A count may be started at any time that a wrestler's shoulders are down (both shoulders touching the mat), back-first and any part of the opponent's body is lying over the wrestler. This often results in pins that can easily be kicked out of, if the defensive wrestler is even slightly conscious. For example, an attacki...
However, although almost any scenario where one wrestler is covering another prone, back-first wrestler can be considered a pin attempt, there is one important exception to that rule: Pin attempts broken up by other wrestlers. In matches involving multiple wrestlers (such as triple threat matches or tag team matches), ...
Illegal pinning methods include using the ropes for leverage and hooking the opponent's clothing, which are therefore popular cheating methods for heels, unless certain stipulations make such an advantage legal. Such pins as these are rarely seen by the referee (as they have to see if their shoulders are down) and are ...
A wrestler may voluntarily submit by verbally informing the referee (usually used in moves such as the Mexican Surfboard, where all four limbs are incapacitated, making tapping impossible). Also, since Ken Shamrock (a legitimate UFC competitor in its early days) popularized it in 1997, a wrestler can indicate a volunta...
Submission was initially a large factor in professional wrestling, but following the decline of the submission-oriented catch-as-catch-can style from mainstream professional wrestling, the submission largely faded until the rise of the legitimate sport of mixed martial arts. Despite this, some wrestlers, such as Chris ...
Since all contact between the wrestlers must cease if any part of the body is touching, or underneath, the ropes, many wrestlers will attempt to break submission holds by deliberately grabbing the bottom ropes. This is called a "rope break", and it is one of the most common ways to break a submission hold. Most holds l...
A wrestler can win by knockout (sometimes referred to as a referee stoppage) if they do not resort to submission holds, but stills pummels their opponent to the point that they are unconscious or are unable to intelligently defend themselves. To check for a knockout in this manner, a referee will wave their hand in fro...
A referee may stop the match when they or official ring physician decides that a wrestler cannot safely continue the match. This may be decided if the wrestler cannot continue the match due to an injury. At the Great American Bash in 2008, Chris Jericho was declared the winner of a match against Shawn Michaels when Mic...
A countout (alternatively "count-out" or "count out") happens when a wrestler is out of the ring long enough for the referee to count to ten (twenty in some promotions) and thus disqualified. The count is broken and restarted when a wrestler in the ring exits the ring. Playing into this, some wrestlers will "milk" the ...
Disqualification (sometimes abbreviated as "DQ") occurs when a wrestler violates the match's rules, thus losing automatically. Although a countout can technically be considered a disqualification (as it is, for all intents and purposes, an automatic loss suffered as a result of violating a match rule), the two concepts...
In practice, not all rule violations will result in a disqualification as the referee may use their own judgement and is not obligated to stop the match. Usually, the only offenses that the referee will see and immediately disqualify the match on (as opposed to having multiple offenses) are low blows, weapon usage, int...
A professional wrestling match can end in a draw. A draw occurs if both opponents are simultaneously disqualified (as via countout or if the referee loses complete control of the match and both opponents attack each other with no regard to being in a match, like Brock Lesnar vs. Undertaker at Unforgiven in 2002), neith...
A wrestling match may be declared a no contest if the winning conditions are unable to occur. This can be due to excessive interference, loss of referee's control over the match, one or more participants sustaining debilitating injury not caused by the opponent, or the inability of a scheduled match to even begin. A no...
While each wrestling match is ostensibly a competition of athletics and strategy, the goal of each match from a business standpoint is to excite and entertain the audience. Although the competition is staged, dramatic emphasis can be utilized to draw out the most intense reaction from the audience. Heightened interest ...
In Latin America and English-speaking countries, most wrestlers (and other on-stage performers) portray character roles, sometimes with personalities wildly different from their own. These personalities are a gimmick intended to heighten interest in a wrestler without regard to athletic ability. Some can be unrealistic...
An individual wrestler may sometimes use their real name, or a minor variation of it, for much of their career, such as Angelo Poffo, Ernie Ladd, Verne Gagne, Bret Hart, and Randy Orton. Others can keep one ring name for their entire career (cases in point include Chris Jericho, Shawn Michaels, CM Punk and Ricky Steamb...
Typically, matches are staged between a protagonist (historically an audience favorite, known as a babyface, or "the good guy") and an antagonist (historically a villain with arrogance, a tendency to break rules, or other unlikable qualities, called a heel). In recent years, however, antiheroes have also become promine...
At times a character may "turn", altering their face/heel alignment. This may be an abrupt, surprising event, or it may slowly build up over time. It almost always is accomplished with a markable change in behavior on the part of the character. Some turns become defining points in a wrestler's career, as was the case w...
As with personae in general, a character's face or heel alignment may change with time, or remain constant over its lifetime (the most famous example of the latter is Ricky Steamboat, a WWE Hall of Famer who remained a babyface throughout his entire career). Sometimes a character's heel turn will become so popular that...
In some cases a wrestler may possess admirable physical traits but perceived mediocre public speaking abilities (such as Brock Lesnar), or their gimmick may be that of a "wild savage" needing a handler (such as Kamala). Such performers have historically employed a manager, who speaks on their behalf and adds to the per...
While true exhibition matches are not uncommon, most matches tell a story analogous to a scene in a play or film, or an episode of a serial drama: The face will sometimes win (triumph) or sometimes lose (tragedy). Longer story arcs can result from multiple matches over the course of time. Since most promotions have a c...
Other stories result from a natural rivalry between two or more characters. Outside of performance, these are referred to as feuds. A feud can exist between any number of participants and can last for a few days up to multiple decades. The feud between Ric Flair and Ricky Steamboat lasted from the late 1970s into the e...
Also, anything that can be used as an element of drama can exist in professional wrestling stories: romantic relationships (including love triangles and marriage), racism, classism, nepotism, favoritism, corporate corruption, family bonds, personal histories, grudges, theft, cheating, assault, betrayal, bribery, seduct...
Behind the scenes, the bookers in a company will place the title on the most accomplished performer, or those the bookers believe will generate fan interest in terms of event attendance and television viewership. Lower ranked titles may also be used on the performers who show potential, thus allowing them greater expos...
A wrestler's championship accomplishments can be central to their career, becoming a measure of their performance ability and drawing power. In general, a wrestler with multiple title reigns or an extended title reign is indicative of a wrestler's ability to maintain audience interest and/or a wrestler's ability to per...
All notable wrestlers now enter the ring accompanied by music, and regularly add other elements to their entrance. The music played during the ring entrance will usually mirror the wrestler's personality. Many wrestlers, particularly in America, have music and lyrics specially written for their ring entrance. While inv...
The women's division of professional wrestling has maintained a recognized world champion since 1937, when Mildred Burke won the original World Women's title. She then formed the World Women's Wrestling Association in the early 1950s and recognized herself as the first champion, although the championship would be vacat...
In Japan, professional wrestling done by female wrestlers is called joshi puroresu (女子プロレス) or joshi puro for short. Female wrestling is usually handled by promotions that specialize in joshi puroresu rather than divisions of otherwise male-dominated promotions, as is the case in the United States. However, joshi puror...
In the 1980s, mixed tag team matches began to take place, with a male and female on each team and a rule stating that each wrestler could only attack the opponent of the same gender. If a tag was made, the other team had to automatically switch their legal wrestler as well. Despite these restrictions, many mixed tag ma...
Intergender singles bouts were first fought on a national level in the 1990s. This began with Luna Vachon, who faced men in ECW and WWF. Later, Chyna became the first female to hold a belt that was not exclusive to women when she won the Intercontinental Championship. While it is a rare feat in WWE, in TNA, ODB partici...
Some wrestlers may have their own specific "mini me", like Mascarita Sagrada, Alebrije has Quije, etc. There are also cases in which midgets can become valets for a wrestler, and even get physically involved in matches, like Alushe, who often accompanies Tinieblas, or KeMonito, who is portrayed as Consejo Mundial de Lu...
Though they have not had the level of exposure as other wrestlers, bears have long been a part of professional wrestling. Usually declawed and muzzled, they often wrestled shoot matches against audience members, offered a cash reward if they could pin the bear. They also wrestled professionals in worked, often battle r...
Professional wrestling in the U.S. tends to have a heavy focus on story building and the establishment of characters (and their personalities). There is a story for each match, and even a longer story for successive matches. The stories usually contain characters like faces and heels, and less often antiheroes and twee...
Although professional wrestling in Mexico (lucha libre) also has stories and characters, they are less emphasized. Wrestlers in Mexico are traditionally more agile and perform more aerial maneuvers than professional wrestlers in the U.S. who, more often, rely on power moves and strikes to subdue their opponents. The di...
The style of Japanese professional wrestling (puroresu) is again different. With its origins in traditional American style of wrestling and still being under the same genre, it has become an entity in itself. Despite the similarity to its American counterpart in that the outcome of the matches remains predetermined, th...
Those involved in producing professional wrestling have developed a kind of global fraternity, with familial bonds, shared language and passed-down traditions. New performers are expected to "pay their dues" for a few years by working in lower-profile promotions and working as ring crew before working their way upward....
Fans of professional wrestling have their own subculture, comparable to those of science fiction, video games, or comic books (in some cases, the "fandoms" overlap; in recent years, some professional wrestlers, particularly those who nurture an anti-establishment rebel persona, such as CM Punk, have made guest appearan...
Some fans enjoy a pastime of collecting tapes of wrestling shows from specific companies, of certain wrestlers, or of specific genres. The Internet has given fans exposure to worldwide variations of wrestling they would be unable to see otherwise. Since the 1990s, many companies have been founded which deal primarily i...
From the first established world championship, the top professional wrestlers have garnered fame within mainstream society. Each successive generation has produced a number of wrestlers who extend their careers into the realms of music, acting, writing, business, politics or public speaking, and are known to those who ...
Many television shows and films have been produced which portray in-character professional wrestlers as protagonists, such as Ready to Rumble, ¡Mucha Lucha!, Nacho Libre, and the Santo film series. In the wildly popular Rocky series of films about the fictional boxer Rocky Balboa, Rocky III saw its hero fighting a "box...
With its growing popularity, professional wrestling has attracted attention as a subject of serious academic study and journalistic criticism. Many courses, theses, essays, and dissertations have analyzed wrestling's conventions, content, and its role in modern society. It is often included as part of studies on theatr...
However, this was not always the case; in the early 20th century, once it became apparent that the "sport" was worked, pro wrestling was looked down on as a cheap entertainment for the uneducated working class — an attitude that still exists to varying degrees today. The French theorist Roland Barthes was among the fir...
While pro wrestling is often described simplistically as a "soap opera for males", it has also been cited as filling the role of past forms of literature and theatre; a synthesis of classical heroics, commedia dell'arte, revenge tragedies, morality plays, and burlesque. The characters and storylines portrayed by a succ...
Documentary filmmakers have studied the lives of wrestlers and the effects the profession has on them and their families. The 1999 theatrical documentary Beyond the Mat focused on Terry Funk, a wrestler nearing retirement; Mick Foley, a wrestler within his prime; Jake Roberts, a former star fallen from grace; and a sch...
Although professional wrestling is worked, there is a high chance of injury, and even death. Strikes are often stiff, especially in Japan and in independent wrestling promotions such as Combat Zone Wrestling (CZW) and Ring of Honor (ROH). The ring is often made out of 2 by 8 timber planks. Many of the injuries that occ...
Relatively insensitive film, with a correspondingly lower speed index, requires more exposure to light to produce the same image density as a more sensitive film, and is thus commonly termed a slow film. Highly sensitive films are correspondingly termed fast films. In both digital and film photography, the reduction of...
The Warnerke Standard Sensitometer consisted of a frame holding an opaque screen with an array of typically 25 numbered, gradually pigmented squares brought into contact with the photographic plate during a timed test exposure under a phosphorescent tablet excited before by the light of a burning Magnesium ribbon. The ...
The Scheinergrade (Sch.) system was devised by the German astronomer Julius Scheiner (1858–1913) in 1894 originally as a method of comparing the speeds of plates used for astronomical photography. Scheiner's system rated the speed of a plate by the least exposure to produce a visible darkening upon development. Speed w...
The system was later extended to cover larger ranges and some of its practical shortcomings were addressed by the Austrian scientist Josef Maria Eder (1855–1944) and Flemish-born botanist Walter Hecht (de) (1896–1960), (who, in 1919/1920, jointly developed their Eder–Hecht neutral wedge sensitometer measuring emulsion ...
The DIN system, officially DIN standard 4512 by Deutsches Institut für Normung (but still named Deutscher Normenausschuß (DNA) at this time), was published in January 1934. It grew out of drafts for a standardized method of sensitometry put forward by Deutscher Normenausschuß für Phototechnik as proposed by the committ...
As in the Scheiner system, speeds were expressed in 'degrees'. Originally the sensitivity was written as a fraction with 'tenths' (for example "18/10° DIN"), where the resultant value 1.8 represented the relative base 10 logarithm of the speed. 'Tenths' were later abandoned with DIN 4512:1957-11, and the example above ...
On an international level the German DIN 4512 system has been effectively superseded in the 1980s by ISO 6:1974, ISO 2240:1982, and ISO 5800:1979 where the same sensitivity is written in linear and logarithmic form as "ISO 100/21°" (now again with degree symbol). These ISO standards were subsequently adopted by DIN as ...
Before the advent of the ASA system, the system of Weston film speed ratings was introduced by Edward Faraday Weston (1878–1971) and his father Dr. Edward Weston (1850–1936), a British-born electrical engineer, industrialist and founder of the US-based Weston Electrical Instrument Corporation, with the Weston model 617...
The Weston Cadet (model 852 introduced in 1949), Direct Reading (model 853 introduced 1954) and Master III (models 737 and S141.3 introduced in 1956) were the first in their line of exposure meters to switch and utilize the meanwhile established ASA scale instead. Other models used the original Weston scale up until ca...
General Electric switched to use the ASA scale in 1946. Meters manufactured since February 1946 were equipped with the ASA scale (labeled "Exposure Index") already. For some of the older meters with scales in "Film Speed" or "Film Value" (e.g. models DW-48, DW-49 as well as early DW-58 and GW-68 variants), replaceable ...
Based on earlier research work by Loyd Ancile Jones (1884–1954) of Kodak and inspired by the systems of Weston film speed ratings and General Electric film values, the American Standards Association (now named ANSI) defined a new method to determine and specify film speeds of black-and-white negative films in 1943. ASA...
The ASA standard underwent a major revision in 1960 with ASA PH2.5-1960, when the method to determine film speed was refined and previously applied safety factors against under-exposure were abandoned, effectively doubling the nominal speed of many black-and-white negative films. For example, an Ilford HP3 that had bee...
Film speed is found from a plot of optical density vs. log of exposure for the film, known as the D–log H curve or Hurter–Driffield curve. There typically are five regions in the curve: the base + fog, the toe, the linear region, the shoulder, and the overexposed region. For black-and-white negative film, the “speed po...
Film speed is used in the exposure equations to find the appropriate exposure parameters. Four variables are available to the photographer to obtain the desired effect: lighting, film speed, f-number (aperture size), and shutter speed (exposure time). The equation may be expressed as ratios, or, by taking the logarithm...
Upon exposure, the amount of light energy that reaches the film determines the effect upon the emulsion. If the brightness of the light is multiplied by a factor and the exposure of the film decreased by the same factor by varying the camera's shutter speed and aperture, so that the energy received is the same, the fil...
Some high-speed black-and-white films, such as Ilford Delta 3200 and Kodak T-MAX P3200, are marketed with film speeds in excess of their true ISO speed as determined using the ISO testing method. For example, the Ilford product is actually an ISO 1000 film, according to its data sheet. The manufacturers do not indicate...
For digital photo cameras ("digital still cameras"), an exposure index (EI) rating—commonly called ISO setting—is specified by the manufacturer such that the sRGB image files produced by the camera will have a lightness similar to what would be obtained with film of the same EI rating at the same exposure. The usual de...
Digital cameras have far surpassed film in terms of sensitivity to light, with ISO equivalent speeds of up to 409,600, a number that is unfathomable in the realm of conventional film photography. Faster processors, as well as advances in software noise reduction techniques allow this type of processing to be executed t...
The ISO standard ISO 12232:2006 gives digital still camera manufacturers a choice of five different techniques for determining the exposure index rating at each sensitivity setting provided by a particular camera model. Three of the techniques in ISO 12232:2006 are carried over from the 1998 version of the standard, wh...
The Recommended Exposure Index (REI) technique, new in the 2006 version of the standard, allows the manufacturer to specify a camera model’s EI choices arbitrarily. The choices are based solely on the manufacturer’s opinion of what EI values produce well-exposed sRGB images at the various sensor sensitivity settings. T...
The Standard Output Sensitivity (SOS) technique, also new in the 2006 version of the standard, effectively specifies that the average level in the sRGB image must be 18% gray plus or minus 1/3 stop when the exposure is controlled by an automatic exposure control system calibrated per ISO 2721 and set to the EI with no ...

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