As technology advances, so too do the ways in which we record our memories. 720p, for instance, is often cited as an "HDTV" size. But what does it mean to you exactly? 720p is a type of high definition (HD) video recording that's achieved by using 1280x720 pixel resolution (1280 pixels wide by 720 lines high). HD videos are recorded at either 25 frames per second (fps), 30 fps, or 60 fps. 720p broadcasts at the rate of 25 fps. If you're viewing a 720p video in a 720p format, you're actually seeing it in real-time. In other words, what you see is what you get. In the case of 720p video, that 1280x720 pixel resolution is much smaller than that of 1080i and 1080p. But why? The "i" and "p" refer to interlaced and progressive scan formats respectively. Simply put, interlaced video is processed in vertical lines while progressive video is processed from top to bottom line by line. Interlaced scanning formats are comprised of half-resolution images that are displayed twice per frame (30 fps). 1080i, on the other hand, is actually a 720p video format. 1080i's resolution is not double that of 720p's, but rather four times that of 720p. The extra resolution means that 1080i is twice as sharp as 720p. Why does it matter? Well, because both 1080i and 720p are HD images. But they are actually only half the resolution of 1080p--which is what many people think of as "HD." Some people do not care about the difference between 720p, 1080i or 1080p at all--others are fine with it being called "HDTV. 720p is actually the most common resolution for high definition TV. It's used by both satellite and cable providers as well as on standard definition screens. When you think of HDTV now, what do you see? If it's anything besides 720p, then you're not right. 720p is the highest definition that television offers. 1080i and 1080p are still only high definition--and not true "HD" images. So don't let the "720" in 720p fool you into thinking that it isn't full HD--because it is. The pixels are just arranged differently than 1080i or 1080p are. The difference between 720p and 1080i/1080p can be further broken down into categories of display, material, and content. Content that is distributed in 720p format will have a better display when viewed on a 720p television--and it will be displayed in 1080i or 1080p format when viewed on a 1080i or 1080p television. 720pixel, however, is much smaller than the 1920pixel resolution of 1080i or 1080p. But why? This gets back to how these images are processed. In order to record in 720 pixel resolution, you need to record at a rate of 25 fps.
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