figure fade beamer

Question

Is there a way to have a transparent figure which can be made "solid" just like one can have a transperent block which can be made solid?

See figure

only the caption is made transparent and not the actual figure code for generating the above figure

\documentclass[10pt]{beamer}
\mode<presentation> {
    \usetheme{Frankfurt}
}

\usepackage{graphicx} % Allows including images

\setbeamercovered{transparent}

\begin{document}

    \begin{frame}
    \begin{block}{t}
        test
    \end{block}
    %
    \pause
    \begin{block}{t}
        test
    \end{block}

\begin{figure}
    \includegraphics[width = 0.2\textheight]{example-image}
    \caption{1}
\end{figure}
\begin{figure}

\includegraphics[width = 0.2\textheight]{example-image}
\caption{2}
\end{figure}
\end{frame}

\end{document}

any help is highly appreciated

BambOo · Accepted Answer · 2019-09-23T12:42:58.957

You could use the visible on style from this great answer. Note the proposed style is now provided by the aobs-tikz package. Instead of setting opacity to 0 just set it to another value that fits your need (I do not know the default opacity that beamer uses.

\documentclass[10pt]{beamer}
\usepackage{tikz}

\tikzset{
  invisible/.style={opacity=0.3},
  visible on/.style={alt=#1{}{invisible}},
  alt/.code args={<#1>#2#3}{%
    \alt<#1>{\pgfkeysalso{#2}}{\pgfkeysalso{#3}} % \pgfkeysalso doesn't change the path
  },
}

\newcommand{\includegraphicswithwisibility}[3]{
\begin{tikzpicture}
\node[visible on={#1}] at (0,0) {\includegraphics[#2]{#3}};
\end{tikzpicture}
}

\mode<presentation> {
    \usetheme{Frankfurt}
}

\usepackage{graphicx} % Allows including images

\setbeamercovered{transparent}

\begin{document}

\begin{frame}
\begin{block}{t}
    test
\end{block}
%
\pause
\begin{block}{t}
test
\end{block}

\begin{figure}
\includegraphicswithwisibility{<1->}{width = 0.2\textheight}{example-image}
\caption{1}
\end{figure}
\begin{figure}

\includegraphicswithwisibility{<2->}{width = 0.2\textheight}{example-image}
\caption{2}
\end{figure}
\end{frame}

\end{document}

EDIT

To use the aobs-tikz functionnalities, replace

\usepackage{tikz}
\tikzset{
  invisible/.style={opacity=0.3},
  visible on/.style={alt=#1{}{invisible}},
  alt/.code args={<#1>#2#3}{%
    \alt<#1>{\pgfkeysalso{#2}}{\pgfkeysalso{#3}} % \pgfkeysalso doesn't change the path
  },
}

with

\usepackage{aobs-tikz}
\tikzset{invisible/.style={opacity=0.3}}

as aobs-tikz loads tikz. However the package defines the invisible style as invisible/.style={opacity=0,text opacity=0} hence the re-definition of the style.

How would the code look like if one had 2 x 2 figures where each figures has to be transparent and then to turn solid one by one? — Jesper Hagelskjær, Sep 23 '19 at 18:43
Basically, you should use the beamer overlay options like <*> (see the documentation for more explainations). Short explaination if you want to see somenthing between visible between step i and step j type <i-j> first and last may be omitted. For the 2*2 figure, you can use subfigure environments to place the graphics — BambOo, Sep 23 '19 at 19:07

figure fade beamer

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