\usepackage {graphicx}
left\HR\fbox{%
 \includegraphics
    [viewport=20 20 50 100,clip]%
    {w.eps}}\HR right
\quad
left\HR\fbox{%
 \includegraphics
    [trim= 5 5 10 10,clip]%
    {w.eps}}\HR right

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