Arrow and box show a single pixel on a computer screen
A pixel is a node shown in colour on a computer screen and is composed of a mixture of shades of 3 colour sub-pixels – red, green and blue (or commonly known as RGB). There is no set size for a pixel because it depends on screen resolution – the detail the screen can display. A screen with a higher resolution can display more pixels.
A Retina screen developed by Apple is a high-resolution display that has a high pixel density of perhaps 300 pixels per inch (PPI). A lower resolution screen might display just 100 PPI. Retina screens are used by designers to apply colour to digital designs. The colour looks truer when displayed on a Retina screen and both text and images look much sharper.
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