Beamer - Transparent footline?

I am using a picture as a background for beamer slides. I would like to have my name and page numbers at the bottom of the slide. I do not like the bottom bar to cover the background image. Is it possible to make the bottom bar in transparent colour with names and page numbers visible?

These are themes I am using in the example:

\usetheme{Boadilla}
\usefonttheme{structurebold}
\usecolortheme{seagull}


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Here is a solution based on the redefinition of the footline, and the use of \pgfsetfillopacity{<value>} (0=transparent, 1=opaque).

MWE

\documentclass{beamer}
\usefonttheme{structurebold}
\usecolortheme{seagull}

\setbeamertemplate{footline}
{
\leavevmode%
\hbox{%
\end{beamercolorbox}%
\end{beamercolorbox}%
\end{beamercolorbox}}%
\vskip0pt%
}

\title{Title}
\author{Author}
\institute{Institute}
\date{\today}

\begin{document}

\begin{frame}
\maketitle
\end{frame}

\end{document}


Output Obviously you will have to add your background picture but the grey bars are gone and they should be transparent!

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