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]
- Apple II (1977) — 280 × 192 (hi-res mode)
- Macintosh 128K (1984) — 512 × 342
- Macintosh Portable (1989) — 640 x 400
- MessagePad H1000 — (1993) — 240 x 336
- iMac G3 (1998) — 1024 x 768
- eMac (2002) — 1280 x 960
- iPhone (1st generation) (2007) — 320 x 480
- iPhone 4 (2010) — 640 × 960
- iPhone X (2017) — 1125 x 2436
- Pro Display XDR (2019) — 6016 x 3384
References[]
- ↑ Pixel at the Free On-Line Dictionary Of Computing. 1998-05-08.
- ↑ Jan 24, 1984 - Macintosh 128K release by Angry Russian, History of Apple. 2020-05-09.
- ↑ Apple Presents iPhone 4, Apple Inc. 2010-06-07.
- ↑ Using a Retina display, Apple Support. 2021-03-31.
