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124-419: Chroma key compositing , or chroma keying , is a visual-effects and post-production technique for compositing (layering) two or more images or video streams together based on colour hues ( chroma range). The technique has been used in many fields to remove a background from the subject of a photo or video – particularly the newscasting , motion picture , and video game industries. A colour range in

248-423: A garbage matte to expose only the window areas. In order to have figures in one exposure actually move in front of a substituted background in the other, a travelling matte was needed, to occlude the correct portion of the background in each frame. In 1918 Frank Williams patented a travelling matte technique, again based on using a black background. This was used in many films, such as The Invisible Man . In

372-756: A lithograph company. After establishing Warner Bros. Music, Harry appointed his son, Lewis, to manage the company. By 1931, the studio began to feel the effects of the Great Depression, reportedly losing $ 8 million, and an additional $ 14 million the following year. In 1931, Warner Bros. Music head Lewis Warner died from an infected wisdom tooth . Around that time, Zanuck hired screenwriter Wilson Mizner , who had little respect for authority and found it difficult to work with Jack, but became an asset. As time passed, Warner became more tolerant of Mizner and helped invest in Mizner's Brown Derby restaurant. Mizner died of

496-421: A "gangster studio". The studio's first gangster film, Little Caesar , was a great box office success and Edward G. Robinson starred in many of the subsequent Warner gangster films. The studio's next effort, The Public Enemy , made James Cagney arguably the studio's new top star, and Warner Bros. made more gangster films. "Movie for movie, Warners was the most reliable source of entertainment through

620-485: A Bosko clone. By the end of World War II, a new Schlesinger production team, including directors Friz Freleng (started in 1934), Tex Avery (started in 1935), Frank Tashlin (started in 1936), Bob Clampett (started in 1937), Chuck Jones (started in 1938), and Robert McKimson (started in 1946), was formed. Schlesinger's staff developed a fast-paced, irreverent style that made their cartoons globally popular. In 1935, Avery directed Porky Pig cartoons that established

744-425: A bright and saturated image. There are several different quality- and speed-optimised techniques for implementing colour keying in software. In most versions, a function f ( r , g , b ) → α is applied to every pixel in the image. α  (alpha) has a meaning similar to that in alpha compositing techniques. α  ≤ 0 means the pixel is fully in the green screen, α  ≥ 1 means

868-422: A cash settlement. Nevertheless, Cagney left the studio to establish an independent film company with his brother Bill. The Cagneys released their films though Grand National Films ; however, they were not able to get good financing and ran out of money after their third film. Cagney then agreed to return to Warner Bros., after Jack agreed to a contract guaranteeing Cagney would be treated to his own terms. After

992-546: A character created for the Looney Tunes series, is the company's official mascot. The company's name originated from the founding Warner brothers (born Wonsal, Woron, and Wonskolaser before Anglicization): Harry , Albert , Sam , and Jack Warner. Harry, Albert and Sam emigrated as young children with their Polish-Jewish mother to the United States from Krasnosielc , Poland (then part of Congress Poland within

1116-477: A chroma-key background and inserted into the background shot with a distortion effect, in order to create a cloak that is marginally detectable. Difficulties emerge with blue screen when a costume in an effects shot must be blue, such as Superman 's traditional blue outfit. In the 2002 film Spider-Man , in scenes where both Spider-Man and the Green Goblin are in the air, Spider-Man had to be shot in front of

1240-415: A default value of 1.0. A very simple g () is ( r , min( g , b ), b ). This is fairly close to the capabilities of analog and film-based screen pulling. Modern examples of these functions are best described by two closed nested surfaces in 3D RGB space, often quite complex. Colours inside the inner surface are considered green screen. Colours outside the outer surface are opaque foreground. Colours between

1364-529: A dog brought from France after World War I by an American soldier, established their reputation. Rin Tin Tin's third film was the feature Where the North Begins , which was so successful that Jack signed the dog to star in more films for $ 1,000 per week. Rin Tin Tin became the studio's top star. Jack nicknamed him "The Mortgage Lifter" and the success boosted Darryl F. Zanuck 's career. Zanuck eventually became

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1488-684: A few films each year under the First National name until 1938. For thirty years, certain Warner productions were identified (mainly for tax purposes) as 'A Warner Bros.–First National Picture.' In the latter part of 1929, Jack Warner hired George Arliss to star in Disraeli , which was a success. Arliss won an Academy Award for Best Actor and went on to star in nine more movies for the studio. In 1930, Harry acquired more theaters in Atlantic City , despite

1612-425: A filter or the high contrast film's colour sensitivity to expose only blue (and higher) frequencies. Blue light only shines through the colour negative where there is not blue in the scene, so this left the film clear where the blue screen was, and opaque elsewhere, except it also produced clear for any white objects (since they also contained blue). Removing these spots could be done by a suitable double-exposure with

1736-454: A green screen and the Green Goblin had to be shot in front of a blue screen. The colour difference is because Spider-Man wears a costume which is red and blue in colour and the Green Goblin wears a costume which is entirely green in colour. If both were shot in front of the same screen, parts of one character would be erased from the shot. For a clean division of foreground from background, it

1860-509: A green top to make it appear that the subject has no body), because the clothing may be replaced with the background image/video. An example of intentional use of this is when an actor wears a blue covering over a part of his body to make it invisible in the final shot. This technique can be used to achieve an effect similar to that used in the Harry Potter films to create the effect of an invisibility cloak . The actor can also be filmed against

1984-491: A hearse, pedestrians to change direction, and men to turn into women. Méliès, the director of the Théâtre Robert-Houdin , was inspired to develop a series of more than 500 short films, between 1896 and 1913, in the process developing or inventing such techniques as multiple exposures , time-lapse photography , dissolves , and hand-painted color. Because of his ability to seemingly manipulate and transform reality with

2108-460: A heart attack on April 3, 1933. By 1932, musicals were declining in popularity, and the studio was forced to cut musical numbers from many productions and advertise them as straight comedies. The public had begun to associate musicals with color, and thus studios began to abandon its use. Warner Bros. had a contract with Technicolor to produce two more pictures in that process. As a result, the first horror films in color were produced and released by

2232-564: A major loan. With this new money, the Warners bought the pioneer Vitagraph Company which had a nationwide distribution system. In 1925, Warners' also experimented in radio, establishing a successful radio station, KFWB , in Los Angeles. Warner Bros. was a pioneer of films with synchronized sound (then known as "talking pictures" or "talkies"). In 1925, at Sam's urging, Warner's agreed to add this feature to their productions. By February 1926,

2356-540: A mascot to Warner Bros., its various divisions, and Six Flags (which Time Warner once owned). The success of the compilation film The Bugs Bunny/Road Runner Movie in 1979, featuring the archived film of these characters, prompted Warner Bros. to organize Warner Bros. Animation as a new production division to restart production of original material. According to Warner's autobiography, prior to US entry in World War II , Philip Kauffman, Warner Bros. German sales head,

2480-413: A month-long strike. In retaliation, Warner—during his 1947 testimony before Congress about Mission to Moscow —accused multiple employees of ties to Communists. By the end of 1947, the studio reached a record net profit of $ 22   million (equivalent to $ 300 million in 2023). Warner acquired Pathé News from RKO in 1947. On January 5, 1948, Warner offered the first color newsreel , covering

2604-470: A movie's story and appeal. Although most visual effects work is completed during post-production , it usually must be carefully planned and choreographed in pre-production and production . While special effects such as explosions and car chases are made on set , visual effects are primarily executed in post-production with the use of multiple tools and technologies such as graphic design, modeling, animation and similar software. A visual effects supervisor

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2728-431: A narrow frequency band, which can then be separated from the other light using a prism, and projected onto a separate but synchronized film carrier within the camera. This second film is high-contrast black and white, and is processed to produce the matte. A newer technique is to use a retroreflective curtain in the background, along with a ring of bright LEDs around the camera lens . This requires no light to shine on

2852-428: A net profit of $ 674,158.00. By 1936, contracts of musical and silent stars were not renewed, instead being replaced by tough-talking, working-class types who better fit these pictures. As a result, Dorothy Mackaill , Dolores del Río , Bebe Daniels , Frank Fay , Winnie Lightner , Bernice Claire , Alexander Gray, Alice White , and Jack Mulhall that had characterized the urban, modern, and sophisticated attitude of

2976-486: A popular book by former ambassador James W. Gerard , was released. On April 4, 1923, with help from money loaned to Harry by his banker Motley Flint, they formally incorporated as Warner Bros. Pictures, Incorporated . (As late as the 1960s, Warner Bros. claimed 1905 as its founding date.) The first important deal was the acquisition of the rights to Avery Hopwood 's 1919 Broadway play, The Gold Diggers , from theatrical impresario David Belasco . However, Rin Tin Tin ,

3100-419: A quarter of the time needed for other methods. In principle, any type of still background can be used as a chroma key instead of a solid colour. First the background is captured without actors or other foreground elements; then the scene is recorded. The image of the background is used to cancel the background in the actual footage; for example in a digital image, each pixel will have a different chroma key. This

3224-461: A reasonable match. For outdoor scenes, overcast days create a diffuse, evenly coloured light which can be easier to match in the studio, whereas direct sunlight needs to be matched in both direction and overall colour based on time of day. A studio shot taken in front of a green screen will naturally have ambient light the same colour as the screen, due to its light scattering. This effect is known as spill . This can look unnatural or cause portions of

3348-431: A result of losses from the Great Depression, and Harry refused to restore it as the company recovered. Zanuck established his own company. Harry thereafter raised salaries for studio employees. In 1933, Warner was able to link up with newspaper tycoon William Randolph Hearst 's Cosmopolitan Films. Hearst had previously worked with MGM, but ended the association after a dispute with head producer Irving Thalberg over

3472-425: A result of their financial problems, Warner Bros. took the next step and released The Jazz Singer starring Al Jolson . This movie, which includes little sound dialogue, but did feature sound segments of Jolson singing, was a sensation. It signaled the beginning of the era of "talking pictures" and the twilight of the silent era. However, Sam died the night before the opening, preventing the brothers from attending

3596-453: A result, Harry Warner—while speaking at a convention of 1,500 independent exhibitors in Milwaukee, Wisconsin—was able to convince the filmmakers to spend $ 500,000 in newspaper advertising, and Harry saw this as an opportunity to establish theaters in places such as New York City and Los Angeles. As the studio prospered, it gained backing from Wall Street , and in 1924 Goldman Sachs arranged

3720-476: A scene featuring a genie escaping from a bottle was the first use of a proper bluescreen process to create a travelling matte for The Thief of Bagdad (1940), which won the Academy Award for Best Special Effects that year. In 1950, Warner Brothers employee and ex- Kodak researcher Arthur Widmer began working on an ultraviolet travelling matte process. He also began developing bluescreen techniques: one of

3844-440: A technological perspective it was equally possible to use the blue or green channel, but because blue clothing was an ongoing challenge, the green screen came into common use. Newscasters sometimes forget the chroma key dress code, and when the key is applied to clothing of the same colour as the background, the person would seem to disappear into the key. Because green clothing is less common than blue, it soon became apparent that it

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3968-509: A top producer and between 1928 and 1933 served as Jack's right-hand man and executive producer , with responsibilities including day-to-day film production. More success came after Ernst Lubitsch was hired as head director; Harry Rapf left the studio to join Metro-Goldwyn-Mayer . Lubitsch's film The Marriage Circle was the studio's most successful film of 1924, and was on The New York Times best list for that year. Despite

4092-511: A top star and signed him to a new contract, tripling his salary. In 1936, Harry's daughter Doris read a copy of Margaret Mitchell's Gone with the Wind and was interested in making a film adaptation. Doris offered Mitchell $ 50,000 for screen rights. Jack vetoed the deal, realizing it would be an expensive production. Major Paramount star George Raft also eventually proved to be a problem for Jack. Warner had signed him in 1939, finally bringing

4216-672: A top star. Following High Sierra and after Raft had once again turned the part down, Bogart was given the leading role in John Huston 's successful 1941 remake of the studio's 1931 pre-Code film, The Maltese Falcon , based upon the Dashiell Hammett novel. Warner's cartoon unit had its roots in the independent Harman and Ising studio. From 1930 to 1933, Walt Disney Studios alumni Hugh Harman and Rudolf Ising produced musical cartoons for Leon Schlesinger , who sold them to Warner. Harman and Ising introduced their character Bosko in

4340-540: A top studio in Hollywood , but this changed after 1935 as other studios, notably MGM, quickly overshadowed the prestige and glamor that previously characterized Warner Bros. However, in the late 1930s, Bette Davis became the studio's top draw and was even dubbed as "The Fifth Warner Brother". In 1935, Cagney sued Jack Warner for breach of contract. Cagney claimed Warner had forced him to star in more films than his contract required. Cagney eventually dropped his lawsuit after

4464-460: A very successful musical under the direction of Lloyd Bacon. Warner assigned Bacon to "more expensive productions including Footlight Parade , Wonder Bar , Broadway Gondolier " (which he also starred in), and Gold Diggers that saved the company from bankruptcy. In the wake of 42nd Street 's success, the studio produced profitable musicals. These starred Ruby Keeler and Dick Powell and were mostly directed by Busby Berkeley . In 1935,

4588-405: Is achieved by a simple numerical comparison between the video and the pre-selected colour. If the colour at a particular point on the screen matches (either exactly, or in a range), then the video at that point is replaced by the alternate background. In order to create an illusion that characters and objects filmed are present in the intended background scene, the lighting in the two scenes must be

4712-450: Is also important that clothing and hair in the foreground shot have a fairly simple silhouette, as fine details such as frizzy hair may not resolve properly. Similarly, partially transparent elements of the costume cause problems. Blue was originally used for the film industry as making the separations required a film that would only respond to the screen colour, and film that responded only to blue and higher frequencies (ultraviolet, etc.)

4836-559: Is an American film and entertainment studio headquartered at the Warner Bros. Studios complex in Burbank, California , and a subsidiary of Warner Bros. Discovery (WBD). Founded in 1923 by four brothers, Harry , Albert , Sam , and Jack Warner , the company established itself as a leader in the American film industry before diversifying into animation , television , and video games , and

4960-496: Is best to have as narrow a colour range as possible being replaced. A shadow would present itself as a darker colour to the camera and might not register for replacement. This can sometimes be seen in low-budget or live broadcasts where the errors cannot be manually repaired or scenes reshot. The material being used affects the quality and ease of having it evenly lit. Materials which are shiny will be far less successful than those that are not. A shiny surface will have areas that reflect

5084-412: Is filmed or photographed against a background consisting of a single colour or a relatively narrow range of colours, usually blue or green because these colours are considered to be the furthest away from skin tone. The portions of the video which match the pre-selected colour are replaced by the alternate background video. This process is commonly known as " keying ", "keying out" or simply a "key". Green

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5208-474: Is one of the "Big Five" major American film studios , as well as a member of the Motion Picture Association (MPA). The company is known for its film studio division, the Warner Bros. Motion Picture Group , which includes Warner Bros. Pictures , New Line Cinema , Warner Bros. Pictures Animation , Castle Rock Entertainment , DC Studios , and the Warner Bros. Television Group . Bugs Bunny ,

5332-408: Is some use of the specific full-intensity magenta colour #FF00FF in digital colour images to encode (1-bit) transparency; this is sometimes referred to as "magic pink". This is not a photographic technique and the extraction of the foreground from the background is trivial. The biggest challenge when setting up a blue screen or green screen is even lighting and the avoidance of shadow because it

5456-434: Is sometimes referred to as a difference matte . However, this makes it easy for objects to be accidentally removed if they happen to be similar to the background, or for the background to remain due to camera noise or if it happens to change slightly from the reference footage. A background with a repeating pattern alleviates many of these issues, and can be less sensitive to wardrobe colour than solid-colour backdrops. There

5580-404: Is to project a faint image onto the screen. Some films make heavy use of chroma key to add backgrounds that are constructed entirely using computer-generated imagery (CGI). Performances from different takes can be composited together, which allows actors to be filmed separately and then placed together in the same scene. Chroma key allows performers to appear to be in any location without leaving

5704-581: Is used as a backdrop for TV and electronic cinematography more than any other colour because television weather presenters tended to wear blue suits. When chroma keying first came into use in television production, the blue screen that was then the norm in the movie industry was used out of habit, until other practical considerations caused the television industry to move from blue to green screens. Broadcast-quality colour television cameras use separate red, green and blue image sensors, and early analog TV chroma keyers required RGB component video to work reliably. From

5828-592: Is usually involved with the production from an early stage to work closely with production and the film's director to design, guide and lead the teams required to achieve the desired effects. Many studios specialize in visual effects; among them are Digital Domain , DreamWorks , DNEG , Framestore , Weta Digital , Industrial Light & Magic , Pixomondo , Moving Picture Company and Sony Pictures Imageworks & Jellyfish Pictures . Warner Brothers Warner Bros. Entertainment Inc. (commonly known as Warner Bros. , or abbreviated as WB , or WBEI )

5952-646: The Cascade , in New Castle, Pennsylvania , in 1903. When the original building was in danger of being demolished, the modern Warner Bros. called the current building owners and arranged to save it. The owners noted people across the country had asked them to protect it for its historical significance. In 1904, the Warners founded the Pittsburgh -based Duquesne Amusement & Supply Company, to distribute films. In 1912, Harry Warner hired an auditor named Paul Ashley Chase . By

6076-516: The Poverty Row section of Hollywood, and acquire a much larger studio lot in Burbank . They expanded by acquiring the Stanley Corporation, a major theater chain. This gave them a share in rival First National Pictures , of which Stanley owned one-third. In a bidding war with William Fox , Warner Bros. bought more First National shares on September 13, 1928; Jack also appointed Zanuck as

6200-569: The Russian Empire ), in October 1889, a year after their father emigrated to the U.S. and settled in Baltimore , Maryland . As in many other immigrant families, the elder Wonsal children gradually acquired anglicized versions of their Yiddish -sounding names: Szmuel Wonsal became Samuel Warner (nicknamed "Sam"), Hirsz Wonsal became Harry Warner, and Aaron Wonsal (although born with a given name common in

6324-776: The Tournament of Roses Parade and the Rose Bowl Game . In 1948, Bette Davis, still their top actress and now hostile to Jack, was a big problem for Harry after she and others left the studio after completing the film Beyond the Forest . Warner was a party to the United States v. Paramount Pictures, Inc. antitrust case of the 1940s. This action, brought by the Justice Department and the Federal Trade Commission , claimed

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6448-471: The box office and the studio's net loss increased. During this time, Harry and six other movie studio figures were indicted for conspiracy to violate the Sherman Antitrust Act , through an attempt to gain a monopoly over St Louis movie theaters. In 1935, Harry was put on trial; after a mistrial, Harry sold the company's movie theaters and the case was never reopened. 1935 also saw the studio make

6572-646: The cinematograph , the prolific Méliès is sometimes referred to as the "Cinemagician." His most famous film, Le Voyage dans la lune (1902), a whimsical parody of Jules Verne 's From the Earth to the Moon , featured a combination of live action and animation , and also incorporated extensive miniature and matte painting work. thumb VFX today is heavily used in almost all movies produced. Other than films, television series and web series are also known to utilize VFX. àÁ' Bold text' Visual effects are often integral to

6696-407: The focal length of the lenses used can affect the success of chroma key. Another challenge for blue screen or green screen is proper camera exposure . Underexposing or overexposing a coloured backdrop can lead to poor saturation levels. In the case of video cameras, underexposed images can contain high amounts of noise , as well. The background must be bright enough to allow the camera to create

6820-464: The 1920s gave way to James Cagney , Joan Blondell , Edward G. Robinson , Warren William and Barbara Stanwyck , who would be more acceptable to the common man. The studio was one of the most prolific producers of Pre-Code pictures and had a lot of trouble with the censors once they started clamping down on what they considered indecency (around 1934). As a result, Warner Bros. turned to historical pictures from around 1935 to avoid confrontations with

6944-435: The 1920s, Walt Disney used a white backdrop to include human actors with cartoon characters and backgrounds in his Alice Comedies . The blue screen method was developed in the 1930s at RKO Radio Pictures . At RKO, Linwood Dunn used an early version of the travelling matte to create "wipes" – where there were transitions like a windshield wiper in films such as Flying Down to Rio (1933). Credited to Larry Butler ,

7068-688: The Americas) became Albert Warner. Jack, the youngest brother, was born in London, Ontario , during the family's two-year residency in Canada. The three elder brothers began in the movie theater business, having acquired a movie projector with which they showed films in the mining towns of Pennsylvania and Ohio . In the beginning, Sam and Albert Warner invested $ 150 to present Life of an American Fireman and The Great Train Robbery . They opened their first theater,

7192-543: The B's". Foy was able to garnish arguably more profits than any other B-film producer at the time. During Foy's time at the studio, however, Warner fired him seven different times. During 1936, The Story of Louis Pasteur proved a box office success and star Paul Muni won the Oscar for Best Actor in March 1937. The studio's 1937 film The Life of Emile Zola gave the studio the first of its seven Best Picture Oscars . In 1937,

7316-511: The Breen office. In 1936, following the success of The Petrified Forest , Jack signed Humphrey Bogart to a studio contract. Warner, however, did not think Bogart was star material, and cast Bogart in infrequent roles as a villain opposite either James Cagney or Edward Robinson over the next five years. After Hal B. Wallis succeeded Zanuck in 1933, and the Hays Code began to be enforced in 1935,

7440-742: The Flame (1930), Song of the West (1930), The Life of the Party (1930), Sweet Kitty Bellairs (1930), Under a Texas Moon (1930), Bride of the Regiment (1930), Viennese Nights (1931), Woman Hungry (1931), Kiss Me Again (1931), 50 Million Frenchmen (1931) and Manhattan Parade (1932). In addition to these, scores of features were released with Technicolor sequences, as well as numerous Technicolor Specials short subjects . The majority of these color films were musicals. In 1929, Warner Bros. bought

7564-654: The St. Louis-based theater chain Skouras Brothers Enterprises . Following this takeover, Spyros Skouras , the driving force of the chain, became general manager of the Warner Brothers Theater Circuit in America. He worked successfully in that post for two years and turned its losses into profits. Harry produced an adaptation of a Cole Porter musical titled Fifty Million Frenchmen . Through First National,

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7688-511: The background as the subject moves. Prior to the introduction of travelling mattes and optical printing , double exposure was used to introduce elements into a scene which were not present in the initial exposure. This was done using black draping where a green screen would be used today. George Albert Smith first used this approach in 1898. In 1903, The Great Train Robbery by Edwin S. Porter used double exposure to add background scenes to windows which were black when filmed on set, using

7812-449: The background other than the LEDs, which use an extremely small amount of power and space unlike big stage lights , and require no rigging . This advance was made possible by the invention in the 1990s of practical blue LEDs, which also allow for emerald green LEDs. There is also a form of colour keying that uses light spectrum invisible to human eye. Called Thermo-Key, it uses infrared as

7936-521: The beginning of every showing of Don Juan across the country) in 1926. Many film production companies questioned the necessity. Don Juan did not recoup its production cost and Lubitsch left for MGM. By April 1927, the Big Five studios (First National, Paramount, MGM, Universal Pictures , and Producers Distributing) had ruined Warners, and Western Electric renewed Warner's Vitaphone contract with terms that allowed other film companies to test sound. As

8060-420: The beginning of the Great Depression. In July 1930, the studio's banker, Motley Flint, was murdered by a disgruntled investor in another company. Harry acquired a string of music publishers (including M. Witmark & Sons , Remick Music Corp. , and T.B. Harms, Inc. ) to form Warner Bros. Music. In April 1930, Warner Bros. acquired Brunswick Records . Harry obtained radio companies, foreign sound patents and

8184-401: The brothers acquired the studio in 1928. Thanks to the success of The Jazz Singer , the studio was cash-rich. Jolson's next film for the company, The Singing Fool was also a success. With the success of these first talkies ( The Jazz Singer , Lights of New York , The Singing Fool and The Terror ), Warner Bros. became a top studio and the brothers were now able to move out from

8308-477: The camera being more sensitive to green light. In analog television , colour is represented by the phase of the chroma subcarrier relative to a reference oscillator. Chroma key is achieved by comparing the phase of the video to the phase corresponding to the pre-selected colour. In-phase portions of the video are replaced by the alternate background video. In digital colour TV , colour is represented by three numbers (red, green, blue intensity levels). Chroma key

8432-598: The character as the studio's first animated star. In addition to Porky, Daffy Duck (who debuted in 1937's Porky's Duck Hunt ), Elmer Fudd ( Elmer's Candid Camera , 1940), Bugs Bunny ( A Wild Hare , 1940), and Tweety ( A Tale of Two Kitties , 1942) would achieve star power. By 1942, the Schlesinger studio had surpassed Walt Disney Studios as the most successful producer of animated shorts. Warner Bros. bought Schlesinger's cartoon unit in 1944 and renamed it Warner Bros. Cartoons . However, senior management treated

8556-452: The characters to disappear, so must be compensated for, or avoided by using a larger screen placed far from the actors. The depth of field used to record the scene in front of the coloured screen should match that of the background. This can mean recording the actors with a larger depth of field than normal. A chroma key subject must avoid wearing clothes which are similar in colour to the chroma key colour(s) (unless intentional e.g., wearing

8680-444: The cleanest key. In the digital television and cinema age, much of the tweaking that was required to make a good quality key has been automated. However, the one constant that remains is some level of colour coordination to keep foreground subjects from being keyed out. Before electronic chroma keying, compositing was done on (chemical) film. The camera colour negative was printed onto high-contrast black and white negative, using either

8804-409: The colour positive (thus turning any area containing red or green opaque), and many other techniques. The result was film that was clear where the blue screen was, and opaque everywhere else. This is called a female matte , similar to an alpha matte in digital keying. Copying this film onto another high-contrast negative produced the opposite male matte . The background negative was then packed with

8928-515: The company's remaining one-third share from Fox. The Justice Department agreed to allow the purchase if First National was maintained as a separate company. When the Great Depression hit, Warner asked for and got permission to merge the two studios. Soon afterward Warner Bros. moved to the First National lot in Burbank. Though the companies merged, the Justice Department required Warner to release

9052-491: The early 1970s, American and British television networks began using green backdrops instead of blue for their newscasts. During the 1980s, minicomputers were used to control the optical printer. For the film The Empire Strikes Back , Richard Edlund created a "quad optical printer" that accelerated the process considerably and saved money. He received a special Academy Award for his innovation. For decades, travelling matte shots had to be done "locked-down", so that neither

9176-437: The executioner brought the axe above his head, Clark stopped the camera, had all the actors freeze, and had the person playing Mary step off the set. He placed a Mary dummy in the actor's place, restarted filming, and allowed the executioner to bring the axe down, severing the dummy's head. Techniques like these would dominate the production of special effects for a century. It was not only the first use of trickery in cinema, it

9300-408: The fact that most objects in real-world scenes have a colour whose blue-colour component is similar in intensity to their green-colour component. Zbigniew Rybczyński also contributed to bluescreen technology. An optical printer with two projectors, a film camera and a "beam splitter", was used to combine the actor in front of a blue screen together with the background footage, one frame at a time. In

9424-688: The feature Don Juan starring John Barrymore . The film was silent, but it featured a large number of Vitaphone shorts at the beginning. To hype Don Juan ' s release, Harry acquired the large Piccadilly Theater in Manhattan , New York City , and renamed it Warners' Theatre. Don Juan premiered at the Warners' Theatre in New York on August 6, 1926. Throughout the early history of film distribution, theater owners hired orchestras to attend film showings, where they provided soundtracks . Through Vitaphone, Warner Bros. produced eight shorts (which were played at

9548-433: The female matte and exposed onto a final strip of film, then the camera negative was packed with the male matte and was double-printed onto this same film. These two images combined creates the final effect. The most important factor for a key is the colour separation of the foreground (the subject) and background (the screen) – a blue screen will be used if the subject is predominantly green (for example plants), despite

9672-662: The film—sued the studio for displaying "vicious, untrue and false attacks" against him in the film. After appearing in the Warner's film The Man Who Played God , Bette Davis became a top star. In 1933, relief for the studio came after Franklin D. Roosevelt became president and began the New Deal . This economic rebound allowed Warner Bros. to again become profitable. The same year, Zanuck quit. Harry Warner's relationship with Zanuck had become strained after Harry strongly opposed allowing Zanuck's film Baby Face to step outside Hays Code boundaries. The studio reduced his salary as

9796-471: The first Looney Tunes cartoon, Sinkin' in the Bathtub , and created a sister series, Merrie Melodies , in 1931. Harman and Ising broke away from Schlesinger in 1933 due to a contractual dispute, taking Bosko with them to MGM. As a result, Schlesinger started his own studio, Leon Schlesinger Productions , which continued with Merrie Melodies while starting production on Looney Tunes starring Buddy ,

9920-601: The first films to use them was the 1958 adaptation of the Ernest Hemingway novella, The Old Man and the Sea , starring Spencer Tracy . The name "Chroma-Key" was RCA 's trade name for the process, as used on its NBC television broadcasts, incorporating patents granted to RCA's Albert N. Goldsmith. A very early broadcast use was NBC's George Gobel Show in fall 1957. Petro Vlahos was awarded an Academy Award for his refinement of these techniques in 1964. His technique exploits

10044-453: The five integrated studio-theater chain combinations restrained competition. The Supreme Court heard the case in 1948, and ruled for the government. As a result, Warner and four other major studios were forced to separate production from the exhibition. In 1949, the studio's net profit was only $ 10   million (equivalent to $ 128.06 million in 2023). Warner Bros. had two semi-independent production companies that released films through

10168-711: The foreground footage is made transparent, allowing separately filmed background footage or a static image to be inserted into the scene. The chroma keying technique is commonly used in video production and post-production. This technique is also referred to as colour keying , colour-separation overlay ( CSO ; primarily by the BBC ), or by various terms for specific colour-related variants such as green screen or blue screen ; chroma keying can be done with backgrounds of any colour that are uniform and distinct, but green and blue backgrounds are more commonly used because they differ most distinctly in hue from any human skin colour . No part of

10292-451: The governments of England and the United States. By the middle of 1943, however, audiences had tired of war films, but Warner continued to produce them, losing money. In honor of the studio's contributions to the cause, the Navy named a Liberty ship after the brothers' father, Benjamin Warner. Harry christened the ship. By the time the war ended, $ 20 million in war bonds were purchased through

10416-427: The green channel. Green can also be used outdoors where the light colour temperature is significantly blue. Red is avoided as it is in human skin, and any other colour is a mix of primaries and thus produces a less clean extraction. A so-called " yellow screen " is accomplished with a white backdrop. Ordinary stage lighting is used in combination with a bright yellow sodium lamp. The sodium light falls almost entirely in

10540-414: The green screen two stops higher than the subject, or vice versa. Sometimes a shadow can be used to create a visual effect. Areas of the blue screen or green screen with a shadow on them can be replaced with a darker version of the desired background video image, making it look like the person is casting a shadow on them. Any spill of the chroma key colour will make the result look unnatural. A difference in

10664-438: The image in which the colour is blue. If the news presenter wears blue clothes, their clothes will also be replaced with the background video. Chroma keying is also common in the entertainment industry for visual effects in movies and video games. Rotoscopy may instead be carried out on subjects that are not in front of a green (or blue) screen. Motion tracking can also be used in conjunction with chroma keying, such as to move

10788-529: The integration of live-action footage (which may include in-camera special effects) and generated-imagery (digital or optics, animals or creatures) which look realistic, but would be dangerous, expensive, impractical, time-consuming or impossible to capture on film. Visual effects using computer-generated imagery (CGI) have more recently become accessible to the independent filmmaker with the introduction of affordable and relatively easy-to-use animation and compositing software. In 1857, Oscar Rejlander created

10912-421: The key colour, which would not be replaced by background image during postprocessing . For Star Trek: The Next Generation , an ultraviolet light matting process was proposed by Don Lee of CIS Hollywood and developed by Gary Hutzel and the staff of Image G . This involved a fluorescent orange backdrop which made it easier to generate a holdout matte , thus allowing the effects team to produce effects in

11036-409: The lights making them appear pale, while other areas may be darkened. A matte surface will diffuse the reflected light and have a more even colour range. In order to get the cleanest key from shooting green screen, it is necessary to create a value difference between the subject and the green screen. In order to differentiate the subject from the screen, a two-stop difference can be used, either by making

11160-429: The manager of First National Pictures. In 1928, Warner Bros. released Lights of New York , the first all-talking feature. Due to its success, the movie industry converted entirely to sound almost overnight. By the end of 1929, all the major studios were exclusively making sound films. In 1929, First National Pictures released their first film with Warner Bros., Noah's Ark . Despite its expensive budget, Noah's Ark

11284-413: The matted subject nor the background could shift their camera perspective at all. Later, computer-timed, motion-control cameras alleviated this problem, as both the foreground and background could be filmed with the same camera moves. Meteorologists on television often use a field monitor, to the side of the screen, to see where they are putting their hands against the background images. A newer technique

11408-415: The perspective and movement of the foreground perfectly. Modern advances in software and computational power have eliminated the need to accurately place the markers ⁠— ⁠the software figures out their position in space; a potential disadvantage of this is that it requires camera movement, possibly contributing to modern cinematographic techniques whereby the camera is always in motion. The principal subject

11532-439: The pixel is fully in the foreground object, and intermediate values indicate the pixel is partially covered by the foreground object (or it is transparent). A further function g ( r ,  g ,  b ) → ( r ,  g ,  b ) is needed to remove green spill on the foreground objects. A very simple f () function for green screen is A ( r + b ) − Bg where A and B are user adjustable constants with

11656-426: The premiere. Jack became sole head of production. Sam's death also had a great effect on Jack's emotional state, as Sam was arguably Jack's inspiration and favorite brother. In the years to come, Jack kept the studio under tight control. Firing employees was common. Among those whom Jack fired were Rin Tin Tin (in 1929) and Douglas Fairbanks Jr. (in 1933), the latter having served as First National's top star since

11780-551: The revival was affected by Berkeley's arrest for killing three people while driving drunk. By the end of the year, people again tired of Warner Bros. musicals, and the studio — after the huge profits made by 1935 film Captain Blood  — shifted its focus to Errol Flynn swashbucklers . With the collapse of the market for musicals, Warner Bros., under Zanuck, turned to more socially realistic storylines. Because of its many films about gangsters, Warner Bros. soon became known as

11904-513: The scene, and values from user-drawn masks. These produce closed surfaces in space with more than three dimensions. A different class of algorithm tries to figure out a 2D path that separates the foreground from the background. This path can be the output, or the image can be drawn by filling the path with α  = 1 as a final step. An example of such an algorithm is the use of active contour . Most research in recent years has been into these algorithms. Visual effects VFX involves

12028-564: The studio hired Midwestern radio announcer Ronald Reagan , who would eventually become the President of the United States . Although Reagan was initially a B-film actor, Warner Bros. was impressed by his performance in the final scene of Knute Rockne, All American , and agreed to pair him with Flynn in Santa Fe Trail (1940). Reagan then returned to B-films. After his performance in the studio's 1942 Kings Row , Warner decided to make Reagan

12152-411: The studio reported a net loss of $ 333,413. After a long period denying Sam's request for sound, Harry agreed to change, as long as the studio's use of synchronized sound was for background music purposes only. The Warners signed a contract with the sound engineer company Western Electric and established Vitaphone . In 1926, Vitaphone began making films with music and effects tracks, most notably, in

12276-467: The studio since 1935. The court ruled in de Havilland's favor and she left the studio in favor of RKO Radio Pictures, and, eventually, Paramount. Through de Havilland's victory, many of the studio's longtime actors were now freed from their contracts, and Harry decided to terminate the studio's suspension policy. The same year, Jack signed newly released MGM actress Joan Crawford , a former top star who found her career fading. Crawford's first role with

12400-587: The studio was 1944's Hollywood Canteen . Her first starring role at the studio, in the title role as Mildred Pierce (1945), revived her career and earned her an Oscar for Best Actress. In the post-war years, Warner Bros. prospered greatly and continued to create new stars, including Lauren Bacall and Doris Day . By 1946, company payroll reached $ 600,000 a week and net profit topped $ 19.4   million (equivalent to $ 303.1 million in 2023). Jack Warner continued to refuse to meet Screen Actors Guild salary demands. In September 1946, employees engaged in

12524-399: The studio was forced to abandon this realistic approach in order to produce more moralistic, idealized pictures. The studio's historical dramas, melodramas (or "women's pictures"), swashbucklers, and adaptations of best-sellers, with stars like Bette Davis , Olivia de Havilland , Paul Muni , and Errol Flynn , avoided the censors. In 1936, Bette Davis, by now arguably the studio's top star,

12648-408: The studio's profit increased substantially. After the success of the studio's 1929 First National film Noah's Ark , Harry agreed to make Michael Curtiz a major director at the Burbank studio. Mort Blumenstock, a First National screenwriter, became a top writer at the brothers' New York headquarters. In the third quarter, Warner Bros. gained complete control of First National, when Harry purchased

12772-508: The studio's top gangster stars after appearing in the successful film, which convinced audiences to question the American legal system. By January 1933, the film's protagonist Robert Elliot Burns—still imprisoned in New Jersey—and other chain gang prisoners nationwide appealed and were released. In January 1933, Georgia chain gang warden J. Harold Hardy—who was also made into a character in

12896-1038: The studio, the Red Cross collected 5,200 pints of blood plasma from studio employees and 763 of the studio's employees served in the armed forces, including Harry Warner's son-in-law Milton Sperling and Jack's son Jack Warner Jr. Following a dispute over ownership of Casablanca 's Oscar for Best Picture, Wallis resigned. After Casablanca made Bogart a top star, Bogart's relationship with Jack deteriorated. In 1943, Olivia de Havilland (whom Warner frequently loaned to other studios) sued Warner for breach of contract. De Havilland had refused to portray famed abolitionist Elizabeth Blackwell in an upcoming film for Columbia Pictures . Warner responded by sending 150 telegrams to different film production companies, warning them not to hire her for any role. Afterwards, de Havilland discovered employment contracts in California could only last seven years ; de Havilland had been under contract with

13020-452: The studio. Advances in computer technology have simplified the incorporation of motion into composited shots, even when using handheld cameras. Reference points such as a painted grid, X's marked with tape, or equally spaced tennis balls attached to the wall, can be placed onto the coloured background to serve as markers. In post-production, a computer can use these markers to compute the camera's position and thus render an image that matches

13144-656: The studio: Doctor X (1932) and Mystery of the Wax Museum (1933). In the latter part of 1931, Harry Warner rented the Teddington Studios in London, England. The studio focused on making " quota quickies " for the domestic British market and Irving Asher was appointed as the studio's head producer. In 1934, Harry officially purchased the Teddington Studios. In February 1933, Warner Bros. produced 42nd Street ,

13268-410: The subject being filmed or photographed may duplicate the colour used as the backing, or the part may be erroneously identified as part of the backing. It is commonly used for live weather forecast broadcasts in which a news presenter is seen standing in front of a large CGI map which is really a large blue or green background. Using a blue screen, different weather maps are added on the parts of

13392-410: The success of Yankee Doodle Dandy at the box office, Cagney again questioned if the studio would meet his salary demand and again quit to form his own film production and distribution company with Bill. Another employee with whom Warner had troubles was studio producer Bryan Foy . In 1936, Wallis hired Foy as a producer for the studio's low budget B movies leading to his nickname "the keeper of

13516-688: The success of Rin Tin Tin and Lubitsch, Warner's remained a lesser studio. Sam and Jack decided to offer Broadway actor John Barrymore the lead role in Beau Brummel . The film was so successful that Harry signed Barrymore to a long-term contract; like The Marriage Circle , Beau Brummel was named one of the ten best films of the year by the Times . By the end of 1924, Warner Bros. was arguably Hollywood's most successful independent studio, where it competed with "The Big Three" Studios ( First National , Paramount Pictures , and Metro-Goldwyn-Mayer (MGM)). As

13640-409: The surfaces are partially covered, they are more opaque the closer they are to the outer surface. Sometimes more closed surfaces are used to determine how to remove green spill. It is also very common for f () to depend on more than just the current pixel's colour, it may also use the ( x ,  y ) position, the values of nearby pixels, the value from reference images or a statistical colour model of

13764-459: The third top 1930s gangster actor into the Warners fold, knowing that he could carry any gangster picture when either Robinson or Cagney were on suspension. Raft had difficulty working with Bogart and refused to co-star with him. Eventually, Warner agreed to release Raft from his contract in 1943. After Raft had turned the role down, the studio gave Bogart the role of "Mad Dog" Roy Earle in the 1941 film High Sierra , which helped establish him as

13888-472: The thirties and forties, even though it was clearly the most budget-conscious of them all." — Film historian Andrew Sarris in "You Ain't Heard Nothin' Yet.": The American Talking Film History & Memory, 1927–1949 . Another gangster film the studio produced was the critically acclaimed I Am a Fugitive from a Chain Gang , based on a true story and starring Paul Muni , joining Cagney and Robinson as one of

14012-575: The time of World War I , they had begun producing films; in the early 1920s they acquired their first studio facilities on Sunset Boulevard in Hollywood. Sam and Jack produced the pictures, while Harry and Albert, along with their auditor and now-controller Chase, handled finance and distribution in New York City. During World War I their first nationally syndicated film, My Four Years in Germany , based on

14136-610: The treatment of Hearst's longstanding mistress, actress Marion Davies , who was struggling for box office success. Through his partnership with Hearst, Warner signed Davies to a studio contract. Hearst's company and Davies' films, however, did not increase the studio's profits. In 1934, the studio lost over $ 2.5 million, of which $ 500,000 was the result of a 1934 fire at the Burbank studio, destroying 20 years' worth of early Vitagraph, Warner Bros. and First National films. The following year, Hearst's film adaption of William Shakespeare 's A Midsummer Night's Dream (1935) failed at

14260-446: The unit with indifference, beginning with the installation as senior producer of Edward Selzer , whom the creative staff considered an interfering incompetent. Jack Warner had little regard for the company's short film product and reputedly was so ignorant about the studio's animation division that he was mistakenly convinced that the unit produced cartoons of Mickey Mouse , the flagship character of Walt Disney Productions . He sold off

14384-464: The unit's pre-August 1948 library for $ 3,000 each, which proved a shortsighted transaction in light of its eventual value. Warner Bros. Cartoons continued, with intermittent interruptions, until 1969 when it was dissolved as the parent company ceased its production of film shorts entirely. Characters such as Bugs Bunny, Daffy Duck, Tweety , Sylvester , and Porky Pig became central to the company's image in subsequent decades. Bugs in particular remains

14508-516: The war, eliminating its B Pictures unit in 1941. Bryan Foy joined Twentieth Century Fox. During the war era, the studio made Casablanca ; Now, Voyager ; Yankee Doodle Dandy (all 1942); This Is the Army , and Mission to Moscow (both 1943). The last of these films became controversial a few years afterwards. At the premieres of Yankee Doodle Dandy (in Los Angeles, New York, and London), audiences purchased $ 15.6 million in war bonds for

14632-449: The world's first "special effects" image by combining different sections of 32 negatives into a single image, making a montaged combination print . In 1895, Alfred Clark created what is commonly accepted as the first-ever motion picture special effect. While filming a reenactment of the beheading of Mary, Queen of Scots , Clark instructed an actor to step up to the block in Mary's costume. As

14756-447: Was also the first type of photographic trickery that was only possible in a motion picture, and referred to as the " stop trick ". Georges Méliès , an early motion picture pioneer, accidentally discovered the same "stop trick." According to Méliès, his camera jammed while filming a street scene in Paris. When he screened the film, he found that the "stop trick" had caused a truck to turn into

14880-427: Was easier to use a green matte screen than it was to constantly police the clothing choices of on-air talent. Also, because the human eye is more sensitive to green wavelengths, which lie in the middle of the visible light spectrum, the green analog video channel typically carried more signal strength, giving a better signal to noise ratio compared to the other component video channels, so green screen keys could produce

15004-507: Was far easier to manufacture and make reliable than film that somehow excluded both frequencies higher and lower than the screen colour. In television and digital film making, however, it is equally easy to extract any colour, and green quickly became the favoured colour. Bright green is less likely to be in the foreground objects, colour film emulsions usually had much finer grain in the green, and lossy compression used for analog video signals and digital images and movies retain more detail in

15128-588: Was murdered by the Nazis in Berlin in 1936. Harry produced the successful anti-German film The Life of Emile Zola (1937). After that, Harry supervised the production of more anti-German films, including Confessions of a Nazi Spy (1939), The Sea Hawk (1940), which made King Philip II an equivalent of Hitler , Sergeant York , and You're In The Army Now (1941). Harry then decided to focus on producing war films. Warners' cut its film production in half during

15252-494: Was profitable. In 1929, Warner Bros. released On with the Show! , the first all-color all-talking feature. This was followed by Gold Diggers of Broadway which would play in theaters until 1939. The success of these pictures caused a color revolution. Warner Bros. color films from 1929 to 1931 included The Show of Shows (1929), Sally (1929), Bright Lights (1930), Golden Dawn (1930), Hold Everything (1930), Song of

15376-447: Was unhappy with her roles. She traveled to England and tried to break her contract. Davis lost the lawsuit and returned to America. Although many of the studio's employees had problems with Jack Warner, they considered Albert and Harry fair. In the 1930s many actors and actresses who had characterized the realistic pre-Code era, but who were not suited to the new trend into moral and idealized pictures, disappeared. Warner Bros. remained

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