The word pixel is based on a contraction of the two words picture and element (pix and el). Pixels are the smallest controllable element of a picture on the screen. They are physical points in a raster image or the smallest addressable element in a display device. The address of a pixel corresponds to its physical coordinates. LCD pixels are manufactured in a two-dimensional grid, and are often represented using dots or squares, but CRT pixels correspond to their timing mechanisms and sweep rates.
The intensity of each pixel can vary and is typically represented by three or four component intensities:
- Red, green, and blue (RGB)
- Cyan, magenta, yellow, and black (CMYK)