The Simple Guide to Pixels, Resolution and dpi
June 15th, 2011
There is some confusion over the meaning of pixels, resolution and dots per inch (dpi). Pixels and resolution are closely linked and relate to the screen or monitor, as well as images and other material displayed on them, whereas dpi relate to printable material.
Screens, pixels and resolution
To make it easier to visualise resolution, I created an images (left) representing simplified screens with each square representing a pixel. The area of a screen is divided up into a certain number of pixels. This is the screen's resolution.
Because the pixel number displayed and screen sizes vary greatly, from tiny mobile phone displays to 30" monitors, the number of pixels are more difficult to translate into resolution in a meaningful way, which is why the resolution is also referred to as pixels per inch - ppi.
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