Pixel

In digital imaging, a pixel (abbreviated px), pel,[1] or picture element[2] is the smallest addressable element in a raster image, or the smallest addressable element in an all points addressable display device; so it is the smallest controllable element of a picture represented on the screen.

This example shows an image with a portion greatly enlarged so that individual pixels, rendered as small squares, can easily be seen.
A photograph of subpixel display elements on a laptop's LCD screen

Each pixel is a sample of an original image; more samples typically provide more accurate representations of the original. The intensity of each pixel is variable. In color imaging systems, a color is typically represented by three or four component intensities such as red, green, and blue, or cyan, magenta, yellow, and black.

In some contexts (such as descriptions of camera sensors), pixel refers to a single scalar element of a multi-component representation (called a photosite in the camera sensor context, although sensel is sometimes used),[3] while in yet other contexts (like MRI) it may refer to a set of component intensities for a spatial position.


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