This is the smallest addressable
display unit available at a given video addressability. There
is no physical thing on a display that can be called a pixel.
Pixels exist only in the graphics controller bitmap. The screen
image in the bitmap is composed of an array of pixels, arranged
in a rectilinear fashion, with the X axis running horizontally,
perpendicular to the Y axis. A pixel consists of intensity only
(in grayscale monitors) or colour and intensity information
(red, green & blue in colour). While a pixel usually corresponds
to a square or rectangular area, it is displayed as a number
of spots on a CRT. One pixel usually consists of 1.2 or more
dot triads. Flat panel displays are a special case where individual
pixels correspond directly to a picture element on the display.
