How Image Resolution Really Works

Resolution determines the detail contained in an image for the purposes of print output only, typically measured in linear pixels per inch or PPI, resolution is tied to a physical size, and it's essential to obtain the appropriate amount of detail so that the human eye can resolve a printed image when viewed at a particular distance. Reading, for example, at roughly 18in, requires a resolution of 300 pixels per linear inch, whereas the Billboard artwork only requires a resolution of 15 pixels per linear inch when typically viewed at distances of at least 50ft or 50m.
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