Pixel Density (PPI) refers to the concentration of pixels on a particular display, measured in pixels per inch (ppi). Pixel density is calculated by dividing the diagonal pixel resolution of a display by its diagonal size.
Pixel per inch (PPI) or pixels per centimeter (PPCM) is an estimation of the pixel thickness of an electronic picture gadget, for example, a PC screen or TV show, or picture digitizing gadget, for example, a camera or picture scanner.
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