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| HDTV High Definition, and what it means for satellite |
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#31 (permalink) |
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Super Murderator
Join Date: Nov 2005
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I want one already
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#32 (permalink) | |
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#33 (permalink) |
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Join Date: Jan 2007
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Hi All
I found this while searching the web.It explaines a little about HDTV. To really appreciate what 1080 is all about it’s useful to understand HD in general. Three Types Basically there are three types of HD available today: the current 720p format,with 720 (or more commonly 768) lines of resolution displayed progressively, and 1080i, with 1080 lines of resolution displayed interlaced. 1080p has 1080 lines of resolution displayed progressively. The Difference? So what’s the difference between progressive and interlaced? It’s to do withhow a TV creates the image that appears on the screen. An interlaced TV builds the picture in two passes – first it displays all the odd number lines, then it goes back and displays all the even number lines. A progressive set builds the picture in a single pass, making the image that little bit more stable and less prone to flicker. While we’re talking about interlaced signals it’s worth mentioning that 1080i (and not 1080p) is the highest quality signal currently being broadcast by providers like Sky HD. This won’t cause you any problems - if you watch Sky HD on a 1080p HDTV it automatically switches to 1080i mode, so you don’t have to lift a finger. Performance 1080p’s astonishing performance really comes into its own while playing Blu-ray discs and HD DVDs. Because the picture from a Blu-ray disc or HD DVD exactlymatches the resolution of a 1080p screen, every pixel is shown precisely as it should be. In other words, the TV doesn’t need to scale the picture to make everything fit the screen. Scaling On the subject of scaling, if you watch a 720p program on a 1080 TV the picture is scaled up to take advantage of the extra pixels. Similarly, if you watch a 1080 program on a 720 TV the picture is scaled down to make it fit. In both cases you may notice a very slight loss of picture quality. ALBERT ![]() |
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#34 (permalink) |
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Dreamy Super Moderator
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As I pointed out in a previous post, the perfect human eye is unable to detect any difference between 1080p and 720p on a panel les than about 50" diagonal when watched at normal viewing distances. It is not a case of vision quality it is due to the perfect eye's accuity.
That is the main reason that transmissions have not progressed above 720p due to extra cost for no benefit. It is only very recently with the growth in larger panels 50" and above that the 1080p sources such as Blu-Ray and HDTV have become viable. Even then, not for most of us.
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