A pixel is the smallest element of an image that can be uniquely processed, and is defined by its spatial coordinates and encoded with colour values.

  • In digital imaging, a pixel, dots, or picture element is a physical point in an image or the smallest addressable element in a display device; so it is the smallest controllable element of a picture represented on the screen.
  • In practical applications, each pixel represents a colour value for a specific point within an original image.
  • The intensity of each pixel is variable. In colour imaging systems, a colour is typically represented by three or four component intensities such as red, green, and blue, or cyan, magenta, yellow, and black.