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If a screen is 50 cm high and it is at a distance of 250 cm, then in picture heights, its distance is 5 H ( 250 / 50 ). Mathematically, this gives the distances shown in the following table: Distance in picture heights. Here the distance is 3.2 picture heights (H). This is the optimal viewing distance for HD 1080 video.
The ratio of the width to the height of an image is known as the aspect ratio, or more precisely the display aspect ratio (DAR) – the aspect ratio of the image as displayed; for TV, DAR was traditionally 4:3 (a.k.a. fullscreen), with 16:9 (a.k.a. widescreen) now the standard for HDTV.
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The HP LP2065 20 inch (50.8 cm) monitor has an actual viewable area of 20.1 inch (51 cm). [ 13 ] In a more significant case, some monitors such as the Dell UltraSharp UP3216Q (3840×2160 px) are advertised as a 32-inch "class" monitor (137.68 PPI), but the actual viewing area diagonal is 31.5 inches, making the true PPI 139.87.
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IMAX productions use 70 mm wide film (the same as used for 70 mm feature films), but the film runs through the camera and projector horizontally. This allows for a physically larger area for each image. 1.5:1 = 3:2 The aspect ratio of 35 mm film used for still photography when eight perforations are exposed.