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An image that is 2048 pixels in width and 1536 pixels in height has a total of 2048×1536 = 3,145,728 pixels or 3.1 megapixels. One could refer to it as 2048 by 1536 or a 3.1-megapixel image. The image would be a very low quality image (72ppi) if printed at about 28.5 inches wide, but a very good quality (300ppi) image if printed at about 7 ...
This figure is determined by dividing the width (or height) of the display area in pixels by the width (or height) of the display area in inches. It is possible for a display to have different horizontal and vertical PPI measurements (e.g., a typical 4:3 ratio CRT monitor showing a 1280×1024 mode computer display at maximum size, which is a 5: ...
The JPEG File Interchange Format (JFIF) is an image file format standard published as ITU-T Recommendation T.871 and ISO/IEC 10918-5. It defines supplementary specifications for the container format that contains the image data encoded with the JPEG algorithm.
Alternatively, and only where absolutely necessary, users' preferences may be disregarded and the size of the image fixed by specifying a size in pixels: Width px or x Height px or Width x Height px. Scale the image to be no greater than the given width or height, keeping its aspect ratio.
Calculate the scaled pixel size as 1 ⁄ 96 in × (56/28) = 1 ⁄ 48 inch (0.53 mm). Calculate the DPI of the TV as 2160 / (30 in / √ 9^2 + 16^2 × 16) ≈ 82.61 dpi. Calculate the real-pixel count per logical-pixel as 1 ⁄ 48 in × 82.61 dpi ≈ 1.721 pixels. A browser will then choose to use the 1.721× pixel size, or round to a 2× ratio.
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.