How to view opacity in .eps file after latex+dvi2ps+ps2pdf?

I´m tryin to use an image with any part with opacity of 50%.

The .eps file is ok, and I can view it well, with the transparente region in a viewer lika xnview.

The problme is that when I compile my .tex, and obtain the .pdf file, in this .pdf The opacity doesn´t exist.

The .eps file is made with Mathematica 10

My code-example is:

\documentclass[12pt,a4paper]{article}
%\renewcommand{\baselinestretch}{1.5} % interlineado de 1.5

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[spanish]{babel}
\usepackage{graphicx,mwe}

\begin{document}

This is a test.\\
\begin{figure}
  \centering
  % Requires \usepackage{graphicx}
  \includegraphics[width=22mm]{example-image.eps}
  \caption{Fact.Region.}\label{regionfact}  
\end{figure}

\begin{figure}[h!]
  \centering
  % Requires \usepackage{graphicx}
  \includegraphics[width=110mm]{image-opacity.eps}\\
  \caption{Extensión natural de la función, y región factible que nos ocupa.}\label{extensionnatural}
\end{figure}

The cuasi-End.\\

\end{document}

The image-opacity.eps is in this link (I can´t attach this file) enter link description here