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The days of standard definition video are over. You have probably seen high-definition, or HD, on some of the videos you watch or printed on the box your television came in, and you may be wondering what makes HD quality video different.
In technical terms, HD video is any video with a resolution of 1280 x 720 or 1920 x 1080, denoted by 720p and 1080i/1080p respectively. These formats of video can display anywhere from 24 to 60 frames per second and are widescreen (16:9). If you are looking at information on a television, for example, you may notice the words progressive scan or interlace scan. Progressive scanning means the entire picture is drawn for every frame whereas interlace scanning, which is only for 1080 displays, is where half the lines are redrawn every other frame.
Here is the breakdown:
Once you have an HD television, or even without an HDTV, the next thing you will look at is HD content. You can find HD image sources on the Internet and video game consoles or through terrestrial broadcast, direct broadcast satellite and digital cable. Created for the purpose of high-definition video, Blu-ray discs provide ample digital storage for HD video content. The discs were designed to replace traditional DVDs but have largely not been adopted by the general public since their official release in June 2006. A proponent of Blu-ray, Sony designed the PlayStation 3 to play Blu-ray discs while Nintendo's new Wii U will support HD and the Xbox 360 already supports 1080p quality.
There are lots of online video streaming sites, like YouTube, Hulu and Vimeo, that offer HD video. Online, HD quality videos take longer to load, and the image quality of online HD videos is lower than that of broadcast HD, and occasionally poorer than DVD video, because of the heavy compression required.
How and where we watch HD quality videos is changing everyday due to advances in video technology. Whether you have a 50" Panasonic Viera or an Apple iPhone, HD is becoming the industry standard in video resolution, and it is important to know what makes high-definition different from the old standard.
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