What are dmax and imax?

DMAX(DigitalMax) is an image maximization projection system jointly developed by China Film Academy and China Film Group. It consists of two Belgian Barco DP2K-32B digital projectors, a 20/ 12m 2.4 gain metal screen, a circular polarization system, 3D glasses and a linear array surround sound system, and adopts a seat design with large slope, wide line spacing and low viewpoint. April 20 12, the largest domestic image DMAX was born, and the DMAX system was put into use.

IMAX, ImageMaximum (the abbreviation of IMAX, Image Maximum) is a kind of film projection system that can project larger and higher resolution than traditional film. The whole system includes film copying, projector, sound system, screen and so on. IMAX specification shooting. The standard IMAX screen is 22 meters wide and 16 meters high, but it can be played on a larger screen, so far there are more IMAX screens.

Extended data

In order to greatly improve the resolution of the image, IMAX film is shot with a special 65 mm negative and its special camera, and then developed into 70 mm film. The image size of traditional 70mm film is 48.5mm× 22. 1mm, while the image size of IMAX film is 69.6mm× 48.5mm, that is, the format of "15/70"-each frame of film.

Therefore, the photosensitive area of IMAX film per frame is 10 times that of ordinary 35mm film and 3 times that of traditional 70mm film. This determines that the image projected on the "giant screen" is clearer and brighter than ordinary movies. The copy of this film is so heavy that it needs special lifting equipment or the strength of many people to move it when it is shown.

Because the size of IMAX film is much larger than that of ordinary film, the film feeding speed of IMAX film is also three times that of ordinary film, and one frame is shown every 6 milliseconds. The film length shown once every1.7m, and every minute102.6m.. Therefore, the length of a two-hour IMAX movie is 12. 48632 . 6868686866 1

Because the traditional 70mm film is unstable after being magnified more than 500 times (that is, full screen), IMAX specially adopts a "RollingLoop" technology to show the film, adds a compressed air device to speed up the film transmission, and places a cylindrical lens at the front end of the projector to keep the film in a vacuum state.

The IMAX projector is fixed with screws, and the projector is fixed in a completely horizontal state by four screws and gears. IMAX projection system also offsets slight jitter during projection by adding cam control arm, and its shutter length is about 20% longer than that of traditional equipment.

The light bulb of the projector is amazing. The light emitted by the IMAX projector with the maximum power (15 kW) can be seen even on the moon. Therefore, IMAX projection system is expensive, and its weight exceeds 1.8 tons.