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Resolution is Measured in Horizontal x Vertical Pixels An older monitor that displays resolutions of 640 × 480 would display 480 lines containing 640 pixels each. By this measurement, the number of dots per line can be multiplied by the number of lines to identify the total number of pixels displayed by the monitor.
Another popular convention is to cite resolution as the total number of pixels in the image, typically given as number of megapixels, which can be calculated by multiplying pixel columns by pixel rows and dividing by one million. One could refer to it as 2048 by 1536 or a 3.1-megapixel image.
Screen resolution is measured by the number of pixels displayed in each dimension. For example if the screen size is 5.8 inches and screen resolution is 1138 × 680, then PPI can be calculated as 1138X 1138 + 680 × 680 = 1757444. Square root of 1757444 is 1325.69. Now, divide the number 5.8 i.e. 1325.69/5.8 = 228.5.
Take the value in the “Width (mm)” column and divide it by the width in pixels. This is called “pixel size x”. Take the value in the “Height (mm)” column and divide it by the height in pixels. This is called “pixel size y”. Calculate the average between the two values — (“pixel size x” + “pixel size y”) / 2.
There is a simple formula for calculating aspect ratios: aspectRatio = (width / height) . For instance if you want to know the new height of an object, you can use: height = (width / aspectRatio) , and if you need the new width of an object, you can use: width = (height * aspectRatio) .
To determine the dpi (PX/inch) of a screen: Calculate the screen resolution (width x height in pixels). Determine the size of your screen in one direction (width or height). Now divide the pixels (in width or height) by inches (in width or height).
The manufacturer uses a format that references horizontal and vertical pixels to specify the resolution of the display device. For example, 1024×768 refers to a display with a width of 1,024 pixels and a height of 768 pixels.
all feature the same 1024×768 resolution. Larger size plasmas (50 inches and up) use square plasma pixels and offer resolutions of 1366×768 pixels or 1920×1080 pixels (1080p). But in the 42-inch size, 1024×768 is the most common HDTV resolution. And 1080p is not “better” than 720p.
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