720p

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This chart shows the most common display resolutions, 720p being one of the 16:9 formats shown in blue.

720p (720 lines progressive) is a progressive HD signal format with 720 horizontal lines/1280 columns and an aspect ratio (AR) of 16:9 , normally known as widescreen HD (1.78:1). All major HD broadcasting standards (such as SMPTE 292M ) include a 720p format, which has a resolution of 1280×720p.

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 [note 1] frames per second, 720p features the highest temporal resolution possible under the ATSC and DVB standards. The term assumes a widescreen aspect 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 interlace scanning [ 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.

Resolutions [ edit ]

Standard Resolution Aspect ratio
Vintage Small TVs; DVCPROHD [7] 960 × 720 4:3 (effectively 16:9 non-square pixels )
HD (standard) 1280 × 720 16:9
Vertical 720 × 1280 9:16
Youtube 720p 406 × 720 9:16

Notes [ edit ]

  1. ^ It is, however, more commonly broadcast at (60/1.001), or precisely 59. 940059 , 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 ]

References [ edit ]

  1. ^ "720p ? AfterDawn: Glossary of technology terms & acronyms" .
  2. ^ Hoffner, Randy (2008-01-09). "Will the End of NTSC Be the End of 59.94?" . TVTechnology . Retrieved 2010-10-08 .
  3. ^ Briere, Daniel; Patrick Hurley (2006). HDTV for Dummies . For Dummies . p. 13. ISBN   9780470096734 .
  4. ^ "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 .
  5. ^ "720p" . AfterDawn. 2010-08-10 . Retrieved 2010-10-08 .
  6. ^ "720p" . CNET Glossary. Archived from the original on 2010-09-30 . Retrieved 2010-10-08 .
  7. ^ "DVCPRO HD Format Specifications" . Apple, Inc. Archived from the original on 2010-02-16 . Retrieved 2023-06-24 .

External links [ edit ]

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