image

1. data, graphics 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 bits 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 digitalcamera, 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. mathematics 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)