Is it possible to make a picture transparent in beamer?

Question

Here is my MWE.

\documentclass [11 pt, xcolor=pdftex,x11names,table]{beamer} 
    \usetheme{Madrid}
    \setbeamercovered{transparent=15}
\begin{document}
\begin{frame}
    \frametitle{Test}

    \begin{block}<1->{(test)}
        test        
    \end{block}
    \begin{block}<2->{Problem}
text comes here
    \vspace{-1.7 cm}
        \begin{flushright}
            \makebox[0.26\textwidth]{\includegraphics[width=0.26\textwidth]{TEST.jpg}}\\
        \end{flushright}
    \end{block}

\end{frame}

\end{document}

The problem I have is that picture that is supposed to be shown in slide 2 is shown in slide 1 as well. Is it possible to solve the problem while you keep transparent=15?

Answer 1

Using \only<1> you can place a \phantom version of your image (in order to keep the spacing, but not display it), and use the regular, overlay-aware \includegraphics<2-> for the remainder of the slides:

\documentclass{beamer}% http://ctan.org/pkg/beamer
\usetheme{Madrid}
\setbeamercovered{transparent=15}
\begin{document}
\begin{frame}
  \frametitle{Test}
  \begin{block}<1->{(test)}
    test        
  \end{block}
  \begin{block}<2->{Problem}
    text comes here
    %\vspace{-1.7 cm}
    \begin{flushright}
      \only<1>{\mbox{\phantom{\includegraphics[width=0.26\textwidth]{example-image-a}}}}%
      \includegraphics<2->[width=0.26\textwidth]{example-image-a}
    \end{flushright}
  \end{block}
\end{frame}
\end{document}