The illusions or tricks of the eye used in the film, television, theatre, video game, and simulator industries to simulate the imagined events in a story or virtual world are traditionally called special effects (often abbreviated as SFX, SPFX, or simply FX).
Special effects are traditionally divided into the categories of optical effects and mechanical effects. With the emergence of digital film-making tools a greater distinction between special effects and visual effects has been recognized, with "visual effects" referring to digital post-production and "special effects" referring to on-set mechanical effects and in-camera optical effects.
Optical effects (also called photographic effects), are techniques in which images or film frames are created photographically, either "in-camera" using multiple exposure, mattes, or the Schüfftan process, or in post-production processes using an optical printer. An optical effect might be used to place actors or sets against a different background.
Mechanical effects (also called practical or physical effects) are usually accomplished during the live-action shooting. This includes the use of mechanized props, scenery, scale models, animatronics, pyrotechnics and atmospheric effects: creating physical wind, rain, fog, snow, clouds, etc. Making a car appear to drive by itself and blowing up a building are examples of mechanical effects. Mechanical effects are often incorporated into set design and makeup. For example, a set may be built with break-away doors or walls to enhance a fight scene, or prosthetic makeup can be used to make an actor look like a non-human creature.
Since the 1990s, computer generated imagery (CGI) has come to the forefront of special effects technologies. CGI gives film-makers greater control, and allows many effects to be accomplished more safely and convincingly—and even, as technology improves, at lower costs. As a result, many optical and mechanical effects techniques have been superseded by CGI.
Developmental history 
Early development 
In 1856, Oscar Rejlander created the world's first "trick photograph" by combining different sections of 30 negatives into a single image. 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 the executioner brought the axe above his head, Clarke stopped the camera, had all of 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. "Such… techniques would remain at the heart of special effects production for the next century."
This was not only the first use of trickery in the cinema, it was the first type of photographic trickery only possible in a motion picture, i.e. the "stop trick".
In 1896, French magician Georges Méliès accidentally discovered the same "stop trick." According to Melies, 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 a hearse, pedestrians to change direction, and men turn into women. Melies, the stage manager at the Theatre Robert-Houdin, was inspired to develop a series of more than 500 short films, between 1914, in the process developing or inventing such techniques as multiple exposures, time-lapse photography, dissolves, and hand painted colour. Because of his ability to seemingly manipulate and transform reality with 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.
From 1910 to 1920, the main innovations in special effects were the improvements on the matte shot by Norman Dawn. With the original matte shot, pieces of cardboard were placed to block the exposure of the film, which would be exposed later. Dawn combined this technique with the "glass shot." Rather than using cardboard to block certain areas of the film exposure, Dawn simply painted certain areas black to prevent any light from exposing the film. From the partially exposed film, a single frame is then projected onto an easel, where the matte is then drawn. By creating the matte from an image directly from the film, it became incredibly easy to paint an image with proper respect to scale and perspective (the main flaw of the glass shot). Dawn's technique became the textbook for matte shots due to the natural images it created.(Baker, 101-4
During the 1920s and 30s, special effects techniques were improved and refined by the motion picture industry. Many techniques—such as the Schüfftan process—were modifications of illusions from the theater (such as pepper's ghost) and still photography (such as double exposure and matte compositing). Rear projection was a refinement of the use of painted backgrounds in the theater, substituting moving pictures to create moving backgrounds. Lifecasting of faces was imported from traditional maskmaking. Along with makeup advances, fantastic masks could be created which fit the actor perfectly. As material science advanced, horror film maskmaking followed closely.
Several techniques soon developed, such as the "stop trick", wholly original to motion pictures. Animation, creating the illusion of motion, was accomplished with drawings (most notably by Winsor McCay in Gertie the Dinosaur) and with three-dimensional models (most notably by Willis O'Brien in The Lost World and King Kong). Many studios established in-house "special effects" departments, which were responsible for nearly all optical and mechanical aspects of motion-picture trickery.
Also, the challenge of simulating spectacle in motion encouraged the development of the use of miniatures. Naval battles could be depicted with models in studio. Tanks and airplanes could be flown (and crashed) without risk of life and limb. Most impressively, miniatures and matte paintings could be used to depict worlds that never existed. Fritz Lang's film Metropolis was an early special effects spectacular, with innovative use of miniatures, matte paintings, the Schüfftan process, and complex compositing.
An important innovation in special-effects photography was the development of the optical printer. Essentially, an optical printer is a projector aiming into a camera lens, and it was developed to make copies of films for distribution. Until Linwood G. Dunn refined the design and use of the optical printer, effects shots were accomplished as in-camera effects. Dunn demonstrating that it could be used to combine images in novel ways and create new illusions. One early showcase for Dunn was Orson Welles' Citizen Kane, where such locations as Xanadu (and some of Gregg Toland's famous 'deep focus' shots) were essentially created by Dunn's optical printer.
Colour era 
The development of colour photography required greater refinement of effects techniques. Colour enabled the development of such travelling matte techniques as bluescreen and the sodium vapour process. Many films became landmarks in special-effects accomplishments: Forbidden Planet used matte paintings, animation, and miniature work to create spectacular alien environments. In The Ten Commandments, Paramount's John P. Fulton, A.S.C., multiplied the crowds of extras in the Exodus scenes with careful compositing, depicted the massive constructions of Rameses with models, and split the Red Sea in a still-impressive combination of travelling mattes and water tanks. Ray Harryhausen extended the art of stop-motion animation with his special techniques of compositing to create spectacular fantasy adventures such as Jason and the Argonauts (whose climax, a sword battle with seven animated skeletons, is considered a landmark in special effects).
The science fiction boom 
Through the 1950s and 60s numerous new special effects were developed which would dramatically increase the level of realism achievable in science fiction films. The pioneering work of directors such as Pavel Klushantsev would be used by major motion pictures for decades to come.
If one film could be said to have established a new high-bench mark for special effects, it would be 1968's 2001: A Space Odyssey, directed by Stanley Kubrick, who assembled his own effects team (Douglas Trumbull, Tom Howard, Con Pedersen and Wally Veevers) rather than use an in-house effects unit. In this film, the spaceship miniatures were highly detailed and carefully photographed for a realistic depth of field. The shots of spaceships were combined through hand-drawn rotoscopes and careful motion-control work, ensuring that the elements were precisely combined in the camera – a surprising throwback to the silent era, but with spectacular results. Backgrounds of the African vistas in the "Dawn of Man" sequence were combined with soundstage photography via the then-new front projection technique. Scenes set in zero-gravity environments were staged with hidden wires, mirror shots, and large-scale rotating sets. The finale, a voyage through hallucinogenic scenery, was created by Douglas Trumbull using a new technique termed slit-scan.
The 1970s provided two profound changes in the special effects trade. The first was economic: during the industry's recession in the late 1960s and early 1970s, many studios closed down their in-house effects houses. Many technicians became freelancers or founded their own effects companies, sometimes specializing on particular techniques (opticals, animation, etc.).
The second was precipitated by the blockbuster success of two science fiction and fantasy films in 1977. George Lucas's Star Wars ushered in an era of fantasy films with expensive and impressive special-effects. Effects supervisor John Dykstra, A.S.C. and crew developed many improvements in existing effects technology. They developed a computer-controlled camera rig called the "Dykstraflex" that allowed precise repeatability of camera motion, greatly facilitating travelling-matte compositing. Degradation of film images during compositing was minimized by other innovations: the Dykstraflex used VistaVision cameras that photographed widescreen images horizontally along stock, using far more of the film per frame, and thinner-emulsion filmstocks were used in the compositing process. The effects crew assembled by Lucas and Dykstra was dubbed Industrial Light and Magic, and since 1977 has spearheaded most effects innovations.
That same year, Steven Spielberg's film Close Encounters of the Third Kind boasted a finale with impressive special effects by 2001 veteran Douglas Trumbull. In addition to developing his own motion-control system, Trumbull also developed techniques for creating intentional "lens flare" (the shapes created by light reflecting in camera lenses) to provide the film's undefinable shapes of flying saucers.
The success of these films, and others since, has prompted massive studio investment in effects-heavy fantasy films. This has fuelled the establishment of many independent effects houses, a tremendous degree of refinement of existing techniques, and the development of new techniques such as CGI. It has also encouraged within the industry a greater distinction between special effects and visual effects; the latter is used to characterize post-production and optical work, while special effects refers more often to on-set and mechanical effects.
Introduction of computer generated imagery (CGI) 
A recent and profound innovation in special effects has been the development of computer generated imagery, or CGI which has changed nearly every aspect of motion picture special effects. Digital compositing allows far more control and creative freedom than optical compositing, and does not degrade the image like analogue (optical) processes. Digital imagery has enabled technicians to create detailed models, matte "paintings," and even fully realized characters with the malleability of computer software.
The most spectacular use of CGI has been the creation of photographically realistic images of fantasy creations. Images could be created in a computer using the techniques of animated cartoons or model animation. In 1993, stop-motion animators working on the realistic dinosaurs of Steven Spielberg's Jurassic Park were retrained in the use of computer input devices. By 1995, films such as Toy Story underscored that the distinction between live-action films and animated films was no longer clear. Other landmark examples include a character made up of broken pieces of a stained-glass window in Young Sherlock Holmes, a shapeshifting character in Willow, a tentacle of water in The Abyss, the T-1000 Terminator in Terminator 2: Judgment Day, hordes of armies of robots and fantastic creatures in the Star Wars prequel trilogy and The Lord of the Rings trilogy and the planet Pandora in Avatar.
Planning and use 
Although most special effects work is completed during post-production, it must be carefully planned and choreographed in pre-production and production. A Visual effects supervisor is usually involved with the production from an early stage to work closely with the Director and all related personnel to achieve the desired effects.
Live special effects 
Live special effects are effects that are used in front of a live audience, mostly during sporting events, concerts and corporate shows. Types of effects that are commonly used include: flying effects, laser lighting, Theatrical smoke and fog, CO2 effects, pyrotechnics, confetti and other atmospheric effects such as bubbles and snow.
Visual special effects techniques 
- Bullet time
- Computer-generated imagery (often using Shaders)
- Digital compositing
- Dolly zoom
- In-camera effects
- Match moving
- Matte (filmmaking) and Matte painting
- Miniature effects
- Motion control photography
- Optical effects
- Optical printing
- Practical effects
- Prosthetic makeup effects
- Stop motion
- Go motion
- Schüfftan process
- Travelling matte
- Virtual cinematography
- Wire removal
Notable special effects companies 
- Adobe Systems Incorporated (San Jose, CA)
- Animal Logic (Sydney, AU and Venice, CA)
- Bird Studios (London UK)
- BUF Compagnie (Paris, FR)
- CA Scanline (München, DE)
- Cinesite (London/Hollywood)
- CINWIZ (Greater Copenhagen)
- Creature Effects, Inc. (LA, CA, US)
- Digital Domain (Venice, LA, CA, US)
- Double Negative (VFX) (London, UK)
- DreamWorks (LA, CA, US)
- Flash Film Works (LA, CA, US)
- Framestore (London, UK)
- Giantsteps (Venice, CA)
- Hydraulx (Santa Monica, LA, US)
- Image Engine (Vancouver, BC, CA)
- Industrial Light & Magic, founded by George Lucas
- Intelligent Creatures (Toronto, ON, CA)
- Intrigue FX (Canada)
- M5 Industries (San Francisco i.e. Mythbusters)
- Mac Guff (LA, CA, US; Paris, FR)
- Machine Shop (London, UK)
- Matte World Digital (Novato, CA)
- The Mill (London, UK; NY and LA, US)
- Mikros Image (post-production) (Paris, FR; Montreal, CANADA; Liège and Brussels, BEL)
- Modus FX (Montreal, QC, CA)
- NewBlueFX (La Jolla, CA, US)
- Moving Picture Company (Soho, London, UK)
- Rhythm and Hues Studios (LA, CA, US)
- RIOT (Santa Monica, CA and Manhattan, NY, USA)
- Rising Sun Pictures (Adelaide, AU)
- Snowmasters (Lexington, AL, USA)
- Sony Pictures Imageworks (Culver City, CA, USA)
- Strictly FX, live special effects company
- Surreal World (Melbourne, AU)
- Tippett Studio (Berkeley, CA, US)
- Tsuburaya Productions (Hachimanyama, Setagaya, Tokyo, Jap)
- Vision Crew Unlimited
- Weta Digital
- Zoic Studios (Culver City, CA, US)
- ZFX Inc a flying effects company
- Method Studios
||This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (June 2009)|
- Rickitt, 10.
- "Road to the Stars". Retrieved 2010-04-03.
- Cinefex magazine
- American Cinematographer magazine
- Richard Rickitt: Special Effects: The History and Technique, Billboard Books; 2nd edition, 2007; ISBN 0-8230-8408-6
- Movie Magic: The History of Special Effects in the Cinema by John Brosnan (1974)
- Techniques of Special Effects Cinematography by Raymond Fielding (For many years, the standard technical reference. Current edition 1985)
- Special Effects: Titanic and Beyond The online companion site to the NOVA documentary (especially notable are the timeline and glossary)
- T. Porter and T. Duff, "Compositing Digital Images", Proceedings of SIGGRAPH '84, 18 (1984).
- The Art and Science of Digital Compositing (ISBN 0-12-133960-2)
- McClean, Shilo T. (2007). Digital Storytelling: The Narrative Power of Visual Effects in Film. The MIT Press. ISBN 0-262-13465-9.
- Mark Cotta Vaz; Craig Barron: The Invisible Art: The Legends of Movie Matte Painting, Chronicle Books, 2004; ISBN 0-8118-4515-X
- Larry Nile Baker, A History of Special Effects Cinematography in the United States, 1895–1914