Program to make low-res image files look sharper

A number years I heard about a program that makes low-res image files look sharper, by simulating pixels, so that the files can look sharp when printed at a large size.

Does anybody know the name of program?
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Relevant Pages

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    ... Robert Montgomery wrote: ... look sharper, by simulating pixels, so that the files can look sharp when printed at a large size. ...
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