Gradient fill in PDF figure turns out solid filled in compiled document [closed]

UPDATE: It turns out it was a compatibility issue with the PDF viewers. Apple Preview, Adobe Acrobat Professional 8 and Firefox display the compiled document wrongly. Under TeXWork and Adobe Reader 11, Google Chrome it is displayed as intended.

I have a pdf file included as a figure in my document. It has a shape with a gradient fill. I'am afraid, in the compiled (pdflatex) document the shape is filled with a solid colour.

Since there is no compile error or warning indicating the gradient fill, I would like to know where to start correcting this misbehaviour.

\documentclass{article}
\usepackage{graphicx}
\begin{document}
\begin{figure}[htbp]
\centering
\includegraphics[width=100mm]{filename}
\caption{figure caption}
\label{fig:figurelable}
\end{figure}
\end{document}


I included screenshots to illustrate the situation.

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closed as too localized by egreg, Joseph Wright♦Jan 19 '13 at 15:24

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Is it possible to see the PDF with the gradient fill? –  egreg Jan 19 '13 at 14:44
File works for me, displaying correctly in TeXworks build-in PDF viewer. However, it does show as a solid colour in Firefox's HTML5 viewer. Which viewer(s) are you using? –  Joseph Wright Jan 19 '13 at 14:52
I was using apple preview. It displays the original included pdf correctly. I will attach the compiled pdf as well. –  user24537 Jan 19 '13 at 14:53
@user24537 Preview shows your PDF fine, but misses out the colour entirely if I include it in a PDF. However, Adobe Reader on Mac is fine with both. I suggest a viewer issue. –  Joseph Wright Jan 19 '13 at 14:55
I see it correctly with Skim, Preview, Adobe Reader and also the internal previewer of TeXworks. –  egreg Jan 19 '13 at 14:57