2048×1080
Aquí lo explican. En el idioma de Meka. El articulo entero es muy interesante (http://en.wikipedia.org/wiki/Digital_cinema):
Digital projection
There are currently two types of projectors for digital cinema. Early DLP projectors, which were deployed primarily in the U.S., used limited 1280×1024 resolution or the equivalent of 1.3 MP (megapixels). They are still widely used for pre-show advertising but not usually for feature presentations. The DCI specification for digital projectors calls for two levels of playback to be supported: 2K (2048×1080) or 2.2 MP at 24 or 48 frames per second, and 4K (4096×2160) or 8.85 MP at 24 frames per second.
Three manufacturers have licensed the DLP Cinema technology developed by Texas Instruments (TI): Christie Digital Systems, Barco, and NEC. Christie, long established in traditional film projector technology, is the maker of the CP2000 line of projectors—the most widely deployed platform globally (approximately 5,500 units in total). Barco designs and develops visualization products for a variety of selected professional markets including digital cinema. Their DP2K-32B digital cinema projector holds a Guinness World Record for the brightest projector with a brightness of 43,000 center lumens. Next to the DP series of 2K digital cinema projectors, Barco has a range of 4K digital cinema projectors, including the DP4K-32B (for screens up to 32 meters), the first - and still only - DCI-compliant enhanced 4K DLP cinema® projector on the market. NEC currently manufactures the Series II NC1200C, NC2000C and NC3200S 2K projectors for large, medium and small screen respectively, and the NC3240 in 2011 to represent the first generation 4k NEC DCI projector. Starus Digital Cinema Server system, as well as other equipment to connect PCs, analog/digital tape decks and satellite receivers, DVD, and off-air broadcast, and so on, for pre-show and special presentations. While NEC is a relative newcomer to Digital Cinema, Christie is the main player in the U.S. and Barco takes the lead in Europe and Asia.[citation needed] In addition Digital Projection Incorporated (DPI) designed and sold a few DLP Cinema units when TI's 2K technology first debuted but then abandoned the D-Cinema market while continuing to offer DLP-based projectors for non-cinema purposes. Although based on the same 2K TI "light engine" as those of the major players they are so rare as to be virtually unknown in the industry. As of January, 2009, there are more than 6,000 DLP-based Digital Cinema systems installed worldwide, of which 80% are located in North America[3].
The other technology is made by Sony and is labeled "SXRD"(LCOS) technology. The projectors, SRXR220 and SRXR320, offer 4096×2160 (4K) resolution and produce four times the number of pixels of 2K projection. Included in the system is a playback server (LMT-300) along with the ability to show alternative content through the system's 2 input options. Sources could be anything from a Blu-ray Disc player to satellite feeds, yet Sony's systems are priced competitively with the lower resolution 2048×1080 (2K) or 2.2 MP (megapixels) DLP projectors.
Other manufacturers have been developing digital projector technology, but these have not yet been deployed into cinemas and are not commercially available in versions that conform to the DCI specification.
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