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

3D is English "3? The abbreviation of "dimension" in Chinese refers to three dimensions, three dimensions and three coordinates, namely, length, width and height. In other words, it is three-dimensional, and 3D is the concept of space, that is, the space composed of three axes of X, Y and Z is relative to a plane (2D) with only length and width.

Image Maximum (IMAX, the abbreviation of image maximum) is a film projection system, which can project larger and higher resolution films than traditional films.

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.

2, the principle is different

Three-dimensional movies are mainly made by observing the scenery with human eyes. Use two parallel movie cameras to represent people's left and right eyes respectively, and shoot two movie pictures with tiny horizontal parallax at the same time. During screening, two films are respectively loaded into the left and right film projectors, and two polarizers with polarization axes of 90 degrees are respectively installed in front of the projection lens.

The two projectors need to run synchronously and project the picture onto the metal screen at the same time to form a double image of the left image and the right image. When the audience wears special polarized glasses, the polarization axes of the left and right polarizers are perpendicular to each other.

Consistent with the polarization axis in front of the projection lens; The viewer's left eye can only see the left image, and the right eye can only see the right image. The left and right images are superimposed on the retina through binocular convergence function, and the brain nerve produces stereoscopic vision effect. Show a coherent three-dimensional picture, let the audience feel that the scenery is coming, or enter the deep recess of the picture, which can produce a strong sense of "being there".

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.

3. Different dimensions

What we usually contact most are 2d and 3d movies, but the dimensions of 2d and 3d are different. Imax movies refer to large screens, including imax-2d and imax-3d. But now it's usually imax-3d. If IMAX is added to 3D, there will be a huge screen and ultra-luxurious visual enjoyment.

Extended data:

IMAX projection room

IMAX projection room is mainly composed of projection operation room and glasses cleaning room.

Besides an IMAX projection system, there is also a 35mm projector in the projection operation room, so in the future, IMAX cinemas can also be used for general 35mm commercial films.

Projection room temperature: 20-24 degrees (year-round temperature control). Projection room humidity: 45-55 degrees constant humidity (annual humidity control). In addition to constant temperature and humidity, dust control is also an absolute requirement in the environmental requirements of the projection room. In particular, an air filter is installed in the air circulation system of the projection room, so that the air filtration rate can reach over 95%.

Application of 3D technology

Including industrial design, engineering design, mold design, numerical control programming, simulation analysis, virtual reality, exhibition, film and television animation, real estate propaganda film, 3D stereoscopic painting, electronic architecture books, education and training, etc. It is the focus of competition among countries for the commanding heights of the industry.

Baidu encyclopedia -3D

Baidu encyclopedia -IMAX