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Ans . A all should be finite!!

A image is a two-dimensional function f(x,y), where x and y are the spatial (plane) coordinates, and the amplitude of f at any pair of coordinates (x,y) is called the intensity of the image at that level.

an image to become digital, all x , y f should be FINITE

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A digital image is a representation of a two-dimensional image as a finite set of digital values, called picture elements or pixels
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