image
1. Data representing a two-dimensional scene.
A digital image is composed of {pixels} arranged in a
rectangular array with a certain height and width. Each pixel
may consist of one or more {bit}s of information, representing
the brightness of the image at that point and possibly
including colour information encoded as {RGB} triples.
{Images} are usually taken from the real world via a {digital
camera}, {frame grabber}, or {scanner}; or they may be
generated by computer, e.g. by {ray tracing} software.
See also {image formats}, {image processing}.
(1994-10-21)
2. The image (or range) of a {function} is the
set of values obtained by applying the function to all
elements of its {domain}. So, if f : D -> C then the set f(D)
◦ \{ f(d) | d in D \} is the image of D under f. The image is
a subset of C, the {codomain}.
(2000-01-19)