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A great deal of research has gone into human visual acuity and how it relates to viewing distance, information size, and display resolution Viewing distance is often measured in display screen heights In general, the best viewing distance is about 3 to 5 times the screen height Some industry recommendations vary from 2 to 10 times the screen height (the lower the number, the more likely it s the optometry industry) If you sit too close to the screen, you will see video scanline structures and pixels If you sit too far away, you will lose visual detail and will not engage enough of your field of view to draw you into the experience The optimal viewing experience is to fill about 35 degrees of your field of vision while staying beyond the limit of picture resolution The THX recommendation is a 36 degree viewing angle, whereas, SMPTE recommends a 30 degree viewing angle There is disagreement
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about the dimensions of the average human field of view, especially as it relates to watching video, but the vertical range is about 60 to 90 degrees, whereas the horizontal angle varies from 100 to 150 degrees, depending on the individual7 Viewing angle fields broader than about 40 degrees, however, can make the viewer uncomfortable after a period of time because human vision tends to focus toward the center Often the resolution of the display determines the distance at which viewers naturally sit Psychophysical studies have shown that viewers tend to position themselves relative to a scene so that the smallest detail of interest subtends an angle of about 1 minute of arc, which is the limit of discrimination for normal vision This gives an ideal viewing distance of 3,438 pixels, which for a 1920-pixel picture is 18 times the screen width, providing a 32-degree field of view (32 60=1920) For a 1280-pixel image it is 27, but that provides only a 21-degree viewing angle Moving closer in to the SMPTE-recommended distance (19 times width for 30 degrees) means you may see the individual pixels at 14 times resolution
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Attempting to understand optical disc compatibility could wring tears from a granite plinth It does not help that compatibility has many facets and meanings that become increasingly complex as formats have been developed for CD, DVD, HD DVD, BD, and beyond There is backward compatibility, such as Blu-ray players being able to play DVDs and CDs There is forward compatibility (or usually lack of), such as DVD players not being able to play Blu-ray discs, or Blu-ray players perhaps being able to play future multi-layer discs or 3D movies There is sideways compatibility being able to play related formats, such as, DVD players that play DivX files or Blu-ray players that play AVCHD recordings from disc or memory card And, there is also compatibility within a format or format family, which is always expected but does not always work, such as CD players that cannot play CD-Rs or Blu-ray players that cannot play some BD-RE discs The Blu-ray specifications focus more on the discs, file systems, and application formats than on the players There are profiles, performance minimums, and certain functional requirements but, beyond that, player makers are free to implement the specifications as they see fit Unfortunately, failures of compatibility occur at various levels across the range of optical disc technology at the physical level, the logical level (file system and application), and the implementation level (see Table 72) Compatibility problems are also discussed in 9, including problems outside of the player, such as HDMI snags Table 72 Examples of Compatibility Problems
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