Apple Wiki
Apple Wiki

A pixel is the smallest resolvable rectangular area of an image, either on a screen or stored in memory. Each pixel in a monochrome image has its own brightness, from 0 for black to the maximum value for white (255 for an 8-bit pixel) . In a color image, each pixel has its own brightness and color, usually represented as a combination of red, green, and blue intensities (RGB).[1]

Pixel resolutions in Apple products[]

With the release of the original Macintosh 128K in 1984, Apple strove to achieve a minimum pixel density of 72 pixels per inch (PPI) to allow the implementation of WYSIWYG (what you see is what you get) for printing at 144 dpi.[2] With the introduction of Retina displays, starting with the iPhone 4 in 2010, Apple strove to achieve a minimum density of 220 pixels per inch so that individual pixels were no longer discernable at normal viewing distances.[3][4]


  1. Pixel at the Free On-Line Dictionary Of Computing. 1998-05-08.
  2. Jan 24, 1984 - Macintosh 128K release by Angry Russian, History of Apple. 2020-05-09.
  3. Apple Presents iPhone 4, Apple Inc. 2010-06-07.
  4. Using a Retina display, Apple Support. 2021-03-31.

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