Digital cinema refers to the use of digital technology to distribute and project motion pictures. It is different from high-definition television and in particular, is not dependent on using television or HDTV standards, aspect ratios, or frame rates.
a digital cinema system must provide high-quality image and sound, also theater managers require server controls for managing and displaying content in multiple theaters. The distribution studios want their content to be encrypted with secure delivery, playback, and reporting of play times to the distribution company. a system specification for digital cinema. is put forward by Digital Cinema Initiatives (DCI), a joint venture of the six major studios. The standards include picture encoding using the ISO/IEC 15444-1 "JPEG2000" (.jp2) standard ,and audio using the "Broadcast Wave" (.wav) format at 24 bits and 48 kHz or 96 kHz sampling, controlled by an XML-format Composition Playlist, into an MXF-compliant file at a maximum data rate of 250 Mbit/s and the use of the CIE XYZ color space at 12 bits per component encoded with a 2.6 gamma applied at projection,.
The most common acquisition medium for digitally projected features is 35 mm film scanned and processed at 2K (2048Ãƒâ€”1080) or 4K (4096Ãƒâ€”2160) resolution via digital intermediate.The 3K and 4K cameras are also being developed.
In the process, camera-original film negatives are scanned into a digital format on a scanner or a high-resolution telecine. Capture from the camera is converted to an image file format for work in a facility and are 'conformed' to match an edit list created by the film editor, and are then color corrected under the direction of the film's staff. The end result of post-production is a digital intermediate.
Sound, picture and the data are transferred to Digital Cinema Distribution Master (DCDM) which contains all of the digital material needed for projection. The images and sound are then compressed, encrypted, and packaged to form the Digital Cinema Package (DCP).
Early DLP projectors, which were deployed primarily in the U.S., used limited 1280Ãƒâ€”1024 resolution or the equivalent of 1.3 MP . But the The DCI specification for digital projectors calls for two levels of playback to be supported: 2K (2048Ãƒâ€”1080) or 2.2 MP at 24 or 48 frames per second, and 4K (4096Ãƒâ€”2160) or 8.85 MP at 24 frames per second..
-Savings in distribution:A 250 megabit-per-second data rate (as defined by DCI for digital cinema), a typical feature-length movie could fit comfortably on an off the shelf 300 GB hard driveâ€which sell for as little as $40.
-Greater protection for content:A simultaneous worldwide release would alleviate the problem of cam prints and piracy to some degree.
the initial costs for converting theaters to digital are high: up to $150,000 per screen or more while a theater can purchase a film projector for US$50,000 and expect an average life of 30â€œ40 years.
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