Common sense content of digital film technology

1. Technical principles of digital cinema

Digital movies are produced, transmitted and shown in a digital way (namely "0" and "1"). Film shooting, production and storage are carried out by using digital technology and equipment, and transmitted through physical media such as satellite, optical fiber, magnetic disk and optical disk, so as to restore digital signals into images and sounds that meet the film technical standards and show them on the screen.

The research on digital film technology in western countries is mainly represented by SMPTE (American Society of Motion Picture and Television Engineers), which established the Digital Film DC28 organization, which is divided into eight groups to study and formulate different digital technology standards and technical models to replace the distribution and projection of 35mm movies on a global scale.

The overall technology of digital cinema can be divided into four stages. The first stage is to make the image signal in the post-production stage of digital film into a digital film master. The second stage is to entrust a special digital technology service company to digitally compress, encrypt and package the master signal, and then transmit it to the local cinema via satellite or network, or directly burn the master signal into a DVD read-only disc or record it on a carrier such as a magnetic tape, and send it to the local cinema through traditional express mail and other services. The third stage is to receive and store the data signal in the local cinema or regional digital signal control center, obtain and send the screening authorization, and decrypt the password. The fourth stage is to realize the projection of digital signals through digital projection.

2. What are the advantages of digital movies?

Specifically, digital movies refer to film and television works that are recorded, filmed and stored through digital technology and digital equipment, transmitted through physical media such as satellites and optical fibers, and then the digital signals are restored to sound signals and optical signals, and finally projected on the screen.

Digital film was born in the 1980s, when computer technology advanced by leaps and bounds, and a revolution was about to break out, which was quite threatening. Digital movies are produced under this background. Digital movies have incomparable advantages over traditional movies, and it can accomplish many special effects through computers.

Digital cinema has three advantages. First, technological advantages.

Traditional film has some problems such as light source aging and fading, but digital film can ensure that the film is always new and will not shake and flicker. Second, the advantages of playing.

The quality of traditional movies will be damaged in the transmission process, but digital movies can ensure the high quality of movies. Once the digital signal is sent, everyone in the world can enjoy the same quality movies. Third, environmental advantages.

We know that traditional film printing needs chemical raw materials, and these chemical industries will cause huge pollution, and the emergence of digital movies has avoided all this well.

3. The main courses of digital film technology

Introduction to film technology, introduction to film art, audio-visual language, C++ programming, computer graphics foundation, video technology foundation, visual principle, digital photography technology, digital image processing, film and television special effects technology, digital nonlinear editing technology, digital film technology, digital intermediate

4. How to make digital movies?

There are three ways to make it: one is computer generation; The second is to shoot with a high-definition digital camera; Third, after shooting with a film camera, it will be digitized into the computer hard disk.

Judging from the effects of these three shooting methods, the resolution and color reproduction of film are far from what digital movies can catch up with (before 2009). This is related to the different imaging principles. Silver halide film is based on natural photographic imaging, and its particle fineness is much larger than that of photoelectric pixels designed by CCD artificially. With the continuous improvement of computer technology, the resolution of high-definition digital cameras will gradually approach or even reach the level of film cameras, but in terms of color reproduction, high-definition digital cameras still can't reach film cameras.

Therefore, for a long time to come, the best way to make cinema-level digital movies is still to shoot movies early, convert them into digital signals for post-editing, and then convert them into digital video technology. Because the image quality of the previous material shooting has been determined, it will be converted into digital projection in the later stage. The color and details of silver halide are refined by digital technology, and 1 is determined. Its projection effect is far better than that of film projector, which avoids the shortcomings of film flicker and blur.

There are several ways to make digital movies.

The production method of digital film: there are three production methods: one is computer generation; The second is to shoot with a high-definition digital camera; Third, after shooting with a film camera, it will be digitized into the computer hard disk.

Judging from the effects of these three shooting methods, the resolution and color reproduction of film are far from what digital movies can catch up with (before 2009). This is related to the different imaging principles. Silver halide film is based on natural photographic imaging, and its particle fineness is much larger than that of photoelectric pixels designed by CCD artificially. With the continuous improvement of computer technology, the resolution of high-definition digital cameras will gradually approach or even reach the level of film cameras, but in terms of color reproduction, high-definition digital cameras still can't reach film cameras.

Therefore, for a long time to come, the best way to make cinema-level digital movies is still to shoot movies early, convert them into digital signals for post-editing, and then convert them into digital video technology. Because the image quality of the previous material shooting has been determined, it will be converted into digital projection in the later stage. The color and details of silver halide are refined by digital technology, and 1 is determined. Its projection effect is far better than that of film projector, which avoids the shortcomings of film flicker and blur.

6. What's the difference between digital movies and traditional movies?

The difference between digital movies and traditional movies: Compared with traditional movies, the biggest difference of digital movies is that they are no longer distributed in the form of films, but are directly transmitted to end users such as cinemas and families in the form of digital files or through networks and satellites.

Relying on broadband digital storage and traditional technology, digital broadcasting is realized through high brightness, high definition and Gao Fancha electronic projector. Digital film technology enters the micro-world, decomposes the image into the smallest unit pixel, and then recombines, changes or reconstructs a certain part of the image and scene, creating a gripping shot that ordinary photography means can't reach at all, and almost reaches the arbitrary position in creation.

While ensuring the projection of digital movies, cinemas can also broadcast live digital high-definition TV programs such as concerts and sports events with high brightness and high definition screen projection equipment to expand their income. Digital movies can perform brand-new sound effects of 5: 1 channel AC-3 surround sound, which greatly expands the performance space of movie sound and makes the appeal and shock of movie sound reach an unprecedented level.