The number "1080" represents 1,080 lines of vertical resolution (1080 horizontal scan lines),[1] while the letter p stands for progressive scan (meaning the image is not interlaced). 1080p can be referred to as full HD or full high definition to differentiate it from other HDTV video modes.[2] The term usually assumes a widescreen aspect ratio of 16:9, implying a horizontal resolution of 1920 pixels. This creates a frame resolution of 19201080, or 2,073,600 pixels in total. The frame rate in Hertz can be either implied by the context or specified after the letter p, such as 1080p30, meaning 30 Hz.  (Wikipedia 8/8/08)

Note:  For optimum viewing, it is recommended to sit back approximately three times the height of the screen.[9][10][11]

To distinguish the difference between 1080p and 720p with the human eye with 20/20 vision and a 50 Inch screen, you need to be sitting within 6 feet of the screen[citation needed] - approximately half of this recommended distance.


What made Stage6 particularly unusual is that it offered support for 1080p HD video -- although our HD guru Ian Morris mocked the claim on the grounds that, while it offered a frame size and rate of 1080p, the data rate was so low it isn't worth comparing to any 'proper' HD format, such as Blu-ray. Even so, its on-demand, Web-based nature made it lip-smackingly attractive to producers and downloaders alike.



  During the summer of 2007, Nielsen/NetRatings reported that Tudou was one of the fastest growing websites on the Web, growing from 131 to 360 million video clips per week in just three months. According to a July 16, 2007 survey, 55 million video clips are viewed daily on Tudou, with an additional 20,000 new videos uploaded every 24 hours.[5] Neilsen's measurements indicate the website averages nearly 40 million visitors per month.[6]

According to Chinese tracking service iResearch, as of the mid-2007, Tudou has over 50% of the Chinese online video market.[7]