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Pixels and Dots

Pixels and Dots

Every digital photo is made up of a rectangular grid of points, called pixels, each of which can display one of sixteen million colors or several hundred shades of grey. For instance, photos from my camera are 1600 pixels wide by 1200 pixels high. Monitors also display rectangular grids of pixels, often 1024 pixels wide by 768 pixels high.

Not all of a 1600 x 1200 photo can fit on a 1024 x 768 monitor when every pixel in the image is mapped to a pixel on the monitor. To display a photo so it fills a monitor, iPhoto removes pixels on the fly, a process called downsampling.


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