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 for image
From The Free On-line Dictionary of Computing (30 December 2018) :

     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 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 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.
     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.

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