What's the difference between IMAX 3D movies and 3D movies?

This is a separate introduction and features, there are differences. . . . . This question is too professional. I found it online. I hope I can help you ~ ~ 1. What is IMAX? A: IMAX is the abbreviation of Image Maximum, which means "the largest image". Use special 70 mm film; The average film size is only 48.5mm× 22. 1mm, but the image size of IMAX film is 69.6 mm× 48.5 mm ... IMAX film has high resolution, and the image quality projected on the screen is particularly clear and natural. Even on a screen ten times larger than the screen that normally plays 35cm movies, perfect projection can still be presented, and vivid images without coarse graininess make the situation closer to reality. In terms of exposure, the film speed of IMAX film is three times that of ordinary film. In order to create a three-dimensional scene effect, IMAX 3D movies are shown by dual projectors, and polarized glasses are needed to analyze three-dimensional images when watching. Ordinary 3D movies don't have a screen as big as IMAX 3D. Glasses are also based on the red and blue complementary color technology used in film screening, wearing red and blue stereoscopic glasses. There will also be a stereoscopic image after wearing it, but the effect may not be as good as IMAX 3D version. 2. Is 2.IMAX a 3D movie? A: In addition to general IMAX movies, IMAX later developed two new technologies, IMAX-3D and IMAX-DMR, so IMAX movies are not necessarily 3D movies. 3D movie design is the effect of transforming left and right eye images into 3D images through 3D glasses worn by the audience. Traditional 3D film technology stores the visual images of the left and right eyes on the same film at the same time, while IMAX 3D technology not only uses the world's largest IMAX negative, but also uses double films to record and play the images of the left and right eyes respectively, making the images more stereoscopic and clear, and the colors more vivid. 3. Where can I buy an IMAX machine? I want to buy a home theater, can I? A: The P3DGT IMAX projector is the highest-level equipment of IMAX. At present, only Thailand, China, Shanghai and Taiwan Province Province in Asia have the same level of equipment. This projector must keep the visual images of the left eye and the right eye synchronized at a high speed of 24 frames per second, so its stability far exceeds that of ordinary film projection equipment. In addition, because the projected image must be enlarged by 145000 times, the machine must also be kept clean and equipped with the most advanced temperature and humidity control equipment. This machine uses two high-brightness projection lamps of 15000 watts at the same time, which needs to be cooled by a special water cooling system. It is definitely not enough for ordinary cinemas to blow with an electric fan. 4. What's the difference between 4.IMAX commercial blockbusters and ordinary Hollywood commercial movies? A: Spider-Man 3 in IMAX Cinema is a so-called IMAX-DMR movie. IMAX Group has spent five years developing this digital remake technology to convert ordinary commercial films into IMAX format. First, scan each 35cm film at the highest possible resolution and convert it into a digital image. Then the image is sharpened and colorful by computer, which is converted into the world's largest negative format-IMAX. At the same time, this system will also convert the original sound effect of the film into IMAX surround sound effect with 7. 1 channel, and the power is 12000 watts. Compared with digital projection movies that also emphasize rich colors and sharp images, IMAX is not inferior at all. Historical details of IMAX: (The following is a paper, hehe! For a long time, people have been hoping to enhance the visual shock of movies. Cinemascope and VistaVision broaden the image of 35mm film, and a multi-projector system like Cinerama can project a wider and more realistic picture. However, the system is not easy to operate and install, and the images between projectors cannot overlap each other, which affects the viewing quality. IMAX was invented by three Canadians: Graeme Ferguson, Roman Kroitor and Robert Kerr. 1967 World Expo held in Montreal, there were many technical problems in their multi-projector large-screen projection system, which prompted them to design a new system with single projector and single camera. The first IMAX film was shown at the World Expo held in Osaka, Japan in 1970, and a long-term IMAX system was installed in Toronto in 197 1. 1974 At the World Expo held in Spokane, Washington, USA, the USA Pavilion exhibited a giant IMAX screen of 27.3x19.7m. When the audience looked straight ahead, the screen was enough to fill the whole field of vision. * * * has been watched by 5 million people, most of whom think it shows a strong sense of movement, and a few even get seasick. This screen has only been on display for six months. A few years later, the IMAX cinema in Binhe Park installed a standard-sized IMAX screen, which has been in use ever since. The first IMAX theater with hemispherical screen opened on 1973 at Ruben H. Fleet Space Theater and Science Center in balboa Park, San Diego, California, USA. Until May 2003, there were 230 IMAX cinemas in 34 countries, of which about half were commercial cinemas and the other half were educational institutions such as museums. In order to greatly increase the resolution of the image, IMAX uses a special 70 mm negative. The image size of the traditional 70mm film is 48.5mm× 22. 1mm (Todd-AO), and the image size of the IMAX film is 69.6 mm× 48.5 mm. In order to expose at the speed of 24 frames per second of the standard film, the speed of the IMAX film is three times that of the ordinary film. There are some technical difficulties in showing a blockbuster-the traditional 70 mm film is not stable enough after being enlarged by 586 times. So IMAX needs some new technologies. William Shaw of IMAX Company adopted an Australian patented technology called "rolling cycle" to screen movies, mainly adding a compressed air device to speed up the film rolling, and placing a cylindrical lens at the front end of the projector to keep a vacuum state during the screening. The IMAX projector is fixed with screws, and the projector is fixed in a completely horizontal state by four screws and gears. Xiao also added a cam control arm to offset the slight shaking during the screening. The shutter length of the projector is also about 20% longer than that of traditional equipment, and the brightness of the lamp tube is higher. The largest xenon arc lamp 12- 18 kW even needs water-cooled electrodes. Therefore, the cost of IMAX system is not cheap, and the weight reaches 1.8 metric tons. IMAX is based on Kodak's ESTAR (also known as PET, also known as DuPont's Mylar? 0? 3) The reason is not the strength of the substrate, but the size of the substrate will not be affected by the developed chemical solution. IMAX's film feeding equipment has strict requirements on the side hole or thickness change of the film. IMAX film can be classified as "15/70" film, which means that this 70mm film has 15 side holes per frame. IMAX film is very heavy, and the film reel is much larger than ordinary movies. In order to make full use of the movie area without sound track, IMAX movies use six-channel 35 mm tape to play the sound synchronized with the picture. In the early1990s, the digitized six-channel sound source separated from the picture was changed into a more accurate pulse generator as the synchronous signal source of the traditional SMPTE time code. This is the predecessor of dolby digital, DTS and other cinema multi-channel systems in the future. With the continuous development of IMAX, new expression techniques appear, such as stereoscopic images, up to 48 frames per second. In terms of sound system, there are Sonic-DDP (direct disc player), stereo sound system and oval speaker group. The structure of IMAX is also very different from that of ordinary cinemas. Due to the improvement of picture resolution, the audience can get closer to the screen. Generally, all seats are within the height of one screen (the span of seats in traditional cinemas can reach 8~ 12 screens). In addition, the inclination of the seat is also large (it can reach 23 degrees in the projection room of the hemispherical screen), so that the audience can face the center of the screen. IMAX Dome/OMNIMAX IMAX Dome (formerly known as OMNIMAX, translated into Chinese) is projected on the planetarium as an inclined hemispherical screen. This system uses fisheye lens to shoot, so that the scene of 180 degree can be imaged on the plane negative. When projecting, use another fisheye lens to make the panorama reappear on the screen. The horizontal projection angle of IMAX dome is 180 degrees, and the vertical projection angle is 122 degrees, which is 22 degrees lower than the horizontal line of the projector and 100 degrees higher than the horizontal line of the projector. It is designed with an inclined hemispherical screen. Some planetariums (such as Hong Kong Space Museum) use non-tilted hemispherical screens, so the images are always higher than the horizontal line of the projector, and the audience's seats are further back than ordinary cinemas. IMAX 3D stereoscopic IMAX technology. In order to create a three-dimensional depth of field, IMAX 3D uses dual cameras and dual projectors for shooting and projection. At present, IMAX 3D projection adopts polarized light projection, and stereoscopic images are analyzed by wearing polarized glasses. IMAX HD (48 frames per second) The new IMAX technology increases the frame rate from 24 frames per second to 48 frames per second to reduce the flicker problem. Published in 1992 World Expo in Spain. However, it was abandoned in 2000 because the shooting cost was twice as high as usual. IMAX Digital (IMAX Digital Cinema) released the latest IMAX technology in 2008, which is an IMAX projection specification. There is no IMAX digital camera at present. Digital IMAX can distribute 2D and 3D movies in DCI format, and the projector supports DLP technology, which eliminates the shortcomings of 70 mm film, just like today's digital cinema. Although IMAX is an excellent film format from a technical point of view, it has not been popularized. The cost and transportation difficulties of IMAX production and broadcasting make it shorter than ordinary movies (generally 40 minutes, and 90-minute IMAX movies have appeared in recent years), and the themes are mostly documentaries suitable for popular science institutions such as planetarium. IMAX cameras have been photographed on the Space Shuttle, Himalayas, Atlantic Ocean and Antarctica. Some IMAX cinemas will also play ordinary movies with traditional projection equipment to increase the number of tourists. 1In the late 1990s, a wave of IMAX entertainment elements began, and some films with pure entertainment themes were filmed, such as Tyrannosaurus Rex: Back to Cretaceous (1998) and Haunted Castle (200 1) (both of them are IMAX-3D movies). 1999, Disney produced the first normal-length IMAX animation Fantasia 2000 (later introduced the traditional theatrical version). At the end of 2003, Disney also released the first live-action IMAX movie "Dark Horse Prequel". In the autumn of 2002, IMAX and Universal Studios jointly released the IMAX version of Apollo13 (1995), which was the first time to use IMAX's exclusive "DMR" reproduction technology to convert traditional movies into IMAX format. Other films that have been released, such as Star Wars, have also been processed by DMR technology and transferred to IMAX. Due to technical limitations, the length of films processed by DMR in the early days did not exceed 2 hours. In 2003, "Matrix 2: Reloading" broke through this limitation and became an important milestone in the development of IMAX. At the end of 2003, the sequel "The Matrix Revolution" became the first film to be released simultaneously in IMAX and traditional cinemas. Most viewers have a positive attitude towards the IMAX movie magnified by DMR technology, which brings more visual and auditory enjoyment than the traditional 35mm movie. A typical example is that an audience who watched Apollo 13 commented that "the huge screen, the sound effects of explosion and the thrilling soundtrack of james horner can only be felt in IMAX". DMR amplification technology can't be compared with IMAX format which directly makes the film into 70mm 15 holes. People who are obsessed with the big screen will think that the decline of film technology is roughly synchronized with the replacement of the original processing methods by new, simpler and lower-cost methods. DMR is just an important symbol. IMAX initially only labeled the real 70mm film as "IMAX Experience". Now, it may use this slogan for films amplified by DMR technology. Famous director James? 6? 1 Cameron once directed a 3D IMAX movie about Titanic, Ghost of the Deep Sea. In 2009, he directed another 3D IMAX movie Avatar. Many IMAX movies were remake into HDTV format and played on INHD channel. Technical standard IMAX (15/70) spherical lens group horizontally pulls down 15 holes of each negative, from right to left (from the viewer's perspective), with 24 negatives per second. Lens size: 2.772 inches (70.4 1 mm) by 2.072 inches (52.63 mm) projection size. The horizontal distance of IMAX Dome/OMNIMAX is 0.0 16 "inch, which is the same as IMAX, except that the optical center of the specially-made fisheye lens group is 0.37" inch higher than the horizontal reference line, and the ellipse is projected on the vault screen, and the perfect angle is 20 degrees below the plane and between 1 10 degrees on the plane.