
A digital image is a numeric representation (normally binary) of a two-dimensional image. Depending on whether the image resolution is fixed, it may be of vector or raster type. By itself, the term `digital image` usually refers to raster images or bitmapped images. ==Raster== Raster images have a finite set of digital values, called picture ele.....
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http://en.wikipedia.org/wiki/Digital_image

a depiction recorded electronically to allow viewing or transmission on a computer.
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http://www.encyclo.co.uk/local/21001

A digital image is a representation of a two-dimensional image.
Found on
https://www.encyclo.co.uk/local/21599
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