It should be noted that IMAX can't be completely equal to the giant screen, but because the IMAX version of the film has been mainly displayed in the Chinese market in recent years, mainly based on the 2D giant screen version, but also for the purpose of dissemination of propaganda, in order to facilitate the ordinary The audience understands that many media and theaters are more accustomed to calling the IMAX version of the film a giant screen movie, and there is no big mistake. But the average oversized movie is not an IMAX movie.
In general, the standard IMAX screen is 22 meters wide and 16 meters high, but can be played on a larger screen. The keyword of IMAX is a word "big", and the huge screen is the first impression of IMAX. In addition, IMAX's six-channel stereo and subwoofer sound is quite shocking. 
Currently, IMAX movies are divided into film and digital.
Film IMAX movie
For a long time, people have been hoping to enhance the visual shock of the film. Some people have widened the image of 35mm film, and some people have created a "multi-projector splicing system", but the effect still can not meet the needs of the audience. In order to greatly increase the image resolution, the traditional cinema uses a special 70mm film. The image size of a conventional 70 mm film is 48.5 mm x 22.1 mm, and the image size of an IMAX film is 69.6 mm x 48.5 mm. In order to expose at 24 frames per second in a standard movie, the IMAX film has a film speed that is three times that of a typical film.
It is a certain technical difficulty to project a large format film onto a screen through a projector. After a 570-fold magnification of a conventional 70-mm film, the picture jitter is also amplified, and the picture on the screen is not stable enough. Therefore, IMAX's William used a patented technology called "Rolling Cycle" in Australia for film screening, mainly by adding a compressed air device to accelerate film rolling and placing a cylindrical lens on the front of the projector. Keep a vacuum during the show. The IMAX projector is screwed and the four screws and gears hold the projector in a fully horizontal position. The slight sway during the projection is counteracted by adding a cam control arm.
The length of the door of the projector is also about 20% longer than that of the conventional device. The brightness of the projector's light source is higher. Usually, a 12-18 kW xenon lamp (3-5 watts for a typical projector) is used, so water-cooled electrodes are required.
Therefore, the IMAX system is not cheap, and weighs 1.8 metric tons.
In order to use the film area without the sound track, the IMAX film uses a six-channel 35 mm tape to play the sound of the picture. In the early 1990s, the digitized six-channel sound source separated from the picture was changed to a more accurate pulse generator as the synchronous signal source of the conventional SMPTE time code. This is the predecessor of multi-channel systems for cinemas such as Dolby Digital and DTS.
In terms of sound system, there are Sonic-DDP (Direct Disc Playback), stereo system and elliptical speaker cluster. Unparalleled surround sound system - regular theaters use standard non-independent 5.1 surround sound systems. The IMAX audio system uses five "independent" audio channels and sub-speaker technology. Discrete audio technology projects sound accurately into specific areas of the theater, creating a more realistic and immersive environment.
Soon, IMAX's DSP-based (Digital Signal Processing Technology) audio enhancer will provide customized audio correction support for each show.
Digital IMAX Movies This 3D "Avatar" is released in the digital IMAX theater in addition to the traditional film IMAX theater. Of course, the digital IMAX theater playback equipment is not as complicated as the film IMAX playback device, now new Digital IMAX theaters basically use the DLP digital cinema projector solution provided by Texas Instruments for film screening. Sony's digital projection system is also one of the more mature solutions.
The digital IMAX projection system utilizes a proprietary image optimizer to increase brightness and image fidelity (fidelity is the degree to which an image is accurately reproduced). Since all images are made up of numbers, rendering them as clear and realistic images on the screen according to IMAX's high standards is an essential attribute of the IMAX digital system. The image intensifier has more than 1 trillion floating-point operations (the equivalent of 100 desktop computers working simultaneously). No other digital projection system in the world uses such high processing power.
IMAX continues to evolve and new ways of expression have emerged, such as stereoscopic images and the number of frames up to 48 frames per second. The IIMAX patented immersive cinema design immerses all viewers in the world of film.
IMAX plus 3D technology can be said to completely subvert the film form in the general sense, which is completely a shock and impact of sight and hearing.
The structure of the IMAX theater is also very different from that of an ordinary cinema. As the resolution of the screen increases, the audience can be closer to the screen. Generally, all seats are within the height of a screen (the traditional theater seats can reach 8 to 12 screens), and the seat inclination is also large (on the hemispherical screen). The screening room can be tilted up to 23 degrees), so that the audience can face the center of the screen, and the space of the movie room is very large and gives people a feeling of extraordinary.
It is the IMAX film that has an unparalleled sound and light effect, so it makes it last. In particular, the development of digital cinema has brought about a new round of development, so that more people feel the charm of film art.
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