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720p = 1280 x 720 – is usually known as HD or “HD Ready” resolution 1080p = 1920 x 1080 – is usually known as FHD or “Full HD” resolution 1440p = 2560 x 1440 – is commonly known as QHD or Quad HD resolution, and it is typically seen on gaming monitors and on high-end smartphones. 1440p is four times the resolution of 720p HD. 720p (1280×720 px; also called HD ready or standard HD) is a progressive HDTV signal format with 720 horizontal lines and an aspect ratio (AR) of 16:9, normally known as widescreen HDTV (1.78:1).
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This chart shows the most common display resolutions, 720p being one of the 16:9 formats shown in blue.
720p (1280×720 px; also called HD ready or standard HD) is a progressive HDTV signal format with 720 horizontal lines and an aspect ratio (AR) of 16:9, normally known as widescreen HDTV (1.78:1). All major HDTV broadcasting standards (such as SMPTE 292M) include a 720p format, which has a resolution of 1280×720; however, there are other formats, including HDV Playback and AVCHD for camcorders, that use 720p images with the standard HDTV resolution. The frame rate is standards-dependent, and for conventional broadcasting appears in 50 progressive frames per second in former PAL/SECAM countries (Europe, Australia, others), and 59.94 frames per second in former NTSC countries (North America, Japan, Brazil, others).
The number 720 stands for the 720 horizontal scan lines of image display resolution (also known as 720 pixels of vertical resolution).[1] The p stands for progressive scan, i.e. non-interlaced. When broadcast at 60.00 frames/s[note 1] frames per second, 720p features the highest temporal resolution possible under the ATSC and DVB standards. The term assumes a widescreenaspect ratio of 16:9, thus implying a resolution of 1280×720 px (0.9 megapixels).
720i (720 lines interlaced) is an erroneous term found in numerous sources and publications. Typically, it is a typographical error in which the author is referring to the 720p HDTV format. However, in some cases it is incorrectly presented as an actual alternative format to 720p.[3] No proposed or existing broadcast standard permits 720 interlaced lines in a video frame at any frame rate.[4]
Comparison with 1080i[edit]
Progressive scanning reduces the need to prevent flicker by anti-aliasing single high contrast horizontal lines.[5][6] It is also easier to perform high-quality 50↔60 Hz conversion and slow-motion clips with progressive video.
A 720p60 (720p at 59.94 Hz) video has advantage over 480i and 1080i60 (29.97/30 frame/s, 59.94/60 Hz) in that it comparably reduces the number of 3:2 artifacts introduced during transfer from 24 frame/s film. However, 576i and 1080i50 (25 frame/s, 50 Hz), which are common in Europe, generally do not suffer from pull down artifacts as film frames are simply played at 25 frames and the audio pitch corrected by 25/24. As a result, 720p60 is used for U.S. broadcasts while European HD broadcasts often use 1080i50 24* frame, with a horizontal resolution of 1920 or 1440 depending on bandwidth constraints. However, some European broadcasters do use the 720p50 format, such as German broadcasters ARD and ZDF, and the Norwegian Broadcasting Corporation (NRK). Arte, a dual-language French-German channel produced in collaboration by ARD, ZDF and France Télévisions, broadcasts in German at 720p50 but in French at 1080i50. The Flemish Broadcasting Company (VRT) in Belgium was using 720p50, but switched to 1080i50 a few years ago.[when?]
Resolutions[edit]
Standard | Resolution | Aspect ratio |
---|---|---|
Small TVs | 960×720 | 4:3 |
Standard | 1280x720 | 16:9 |
Notes[edit]
- ^It is however more commonly broadcast at (60/1.001), or precisely 59.940059 frames/sec, matching the NTSC SDTV field rate; this and the 50.00 Hz of PAL are still the second and third highest standard framerates.[2]
See also[edit]
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- 10K, 4320p, 2160p, 1080p, 1080i, 576p, 576i, 480p, 480i, 360p, 240p
- High-definition television (HDTV)
- Low-definition television (LDTV)
References[edit]
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- ^'720p - AfterDawn: Glossary of technology terms & acronyms'.
- ^Hoffner, Randy (2008-01-09). 'Will the End of NTSC Be the End of 59.94?'. TVTechnology. Retrieved 2010-10-08.
- ^Briere, Daniel; Patrick Hurley (2006). HDTV for Dummies. For Dummies. p. 13.
- ^'ATSC Standard: Video System Characteristics of AVC in the ATSC Digital Television System'(PDF). 2008-07-29. Archived from the original(PDF) on 2012-10-04. Retrieved 2011-07-24.
- ^'720p'. AfterDawn. 2010-08-10. Retrieved 2010-10-08.
- ^'720p'. CNET Glossary. Archived from the original on 2010-09-30. Retrieved 2010-10-08.
External links[edit]
Retrieved from 'https://en.wikipedia.org/w/index.php?title=720p&oldid=984547700'