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Most users cannot see or experience the difference between 720p and 1080p, but there are certain exceptions. For people with visual impairments, 720p resolution is enough for viewing without the blurring that occurs at higher resolutions. This is because it fills more of their vision’s field of view. Conversely, 1024 x 768 resolution looks sharper to many people at a distance than 1280x720 because it fills more of their vision’s field of view. "This is only noticeable if you are at least 7 feet away from the screen. When sitting closer than 7 feet, the pixels are already large enough that you can't see them." For example, sports broadcasters may prefer 1080i 50 or 60 Hz for their slow-motion replays because it offers better picture quality than 720p at the same slow-motion speed. Conversely, for other video material (documentaries, etc.), lower resolutions such as 720p may be more attractive because of the lower bandwidth requirements. Both 720p and 1080i50 versions of films are widely available in Europe. Since both versions are distributed widely in different countries, often both versions are released on the same Blu-ray Disc in different regions depending on media availability. 720p was the highest resolution for mainstream HDTVs until June 4, 2010 when the 1080p specification was released and 540p and 2160p (4K) were added to the ITU-R BT.2020 standard. The new standard specifies a minimum of four levels of progressively-higher resolutions: 720p50, 720p60, 1080p23 and 1080p24 (where 23 and 24 indicate frame rate in hertz). These are to be used progressively on displays with an aspect ratio of 1.78:1, 1.85:1, 2.35:1 and 2.40:1 respectively. This standard does not specify the encoding methods or color encodings for each resolution; that is to be completed within the next several years by MPEG as part of the High Efficiency Video Coding (HEVC) project. The maximum resolution of an LCD television capable of displaying a resolution greater than 720p is 1080i (576p vertical and 576i horizontal). For screens that do not support higher resolutions, the video stream will be scaled by default to 720p. However, this can be disabled in the TV's menu options. Sears Holdings (a subsidiary of Kmart) currently sells TVs that perform both 720p and 1080i at once. cfa1e77820
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