avoiding transparent caption in beamer/latex - latex

Question

I am trying to insert a figure but its caption is transparent in the current page. how to prevent this? many thanks in advance.
\documentclass{beamer}
\usetheme{Ilmenau}
\setbeamercovered{transparent}
\setbeamercolor*{item}{fg=blue}
\usepackage{caption}
\captionsetup{font=scriptsize,labelfont=scriptsize}
\usepackage{hyperref}
\hypersetup{urlcolor=blue}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[ngerman]{babel}
\title{DNA - Computing}
\author{Aleyna Acikyol \& Alina Grahic
}
\begin{document}
\begin{frame}[plain]
\maketitle
\end{frame}
%5 FOTO
\begin{frame}{Probleme heutiger Computer (3)}
%\begin{enumerate}
% \item \textcolor{blue}{Transistoren:}
\begin{itemize}
\item \textcolor{blue}{Transistoren:}
\begin{itemize}
\item kleiner geht nicht
\item Ausgleich mit Multicores /Multiprozessorsysteme
\end{itemize}
\end{itemize}
\pause
\begin{figure}
%\begin{itemize}
\begin{columns}
\column{0.50\linewidth}
\centering
\includegraphics[height=3cm, width=3cm]{./5.jpg}\caption{diverse Datenträger im Privatgebrauch}
\column{0.50\linewidth}
\centering
\includegraphics[height=3cm, width=3cm]{./5.2.jpg}\caption{Data Centre, Cloud}
\end{columns}
%\end{itemize}
\end{figure}
%\end{enumerate}
\end{frame}
\end{document}
It looks like

Answer 1

The caption is transparent because you are using \setbeamercovered{transparent}. You have two options to avoid the transparent caption:
immediately show the images and caption by avoid the \pause in front of them
switching to \setbeamercovered{invisible} either temporarily or for the whole presentation to delay the images and caption to the next overlay:
\documentclass{beamer}
\usetheme{Ilmenau}
\setbeamercovered{transparent}
\setbeamercolor*{item}{fg=blue}
\setbeamerfont{caption}{size=\scriptsize}
\usepackage[T1]{fontenc}
\usepackage[ngerman]{babel}
\title{DNA - Computing}
\author{Aleyna Acikyol \& Alina Grahic
}
\begin{document}
\begin{frame}[plain]
\maketitle
\end{frame}
%5 FOTO
\begin{frame}
\frametitle{Probleme heutiger Computer (3)}
%\begin{enumerate}
% \item \textcolor{blue}{Transistoren:}
\begin{itemize}
\item \textcolor{blue}{Transistoren:}
\begin{itemize}
\item kleiner geht nicht
\item Ausgleich mit Multicores /Multiprozessorsysteme
\end{itemize}
\end{itemize}
{
\setbeamercovered{invisible}
\pause
\begin{figure}
%\begin{itemize}
\begin{columns}
\column{0.50\linewidth}
\centering
\includegraphics[height=3cm, width=3cm]{example-image-duck}\caption{diverse Datenträger im Privatgebrauch}
\column{0.50\linewidth}
\centering
\includegraphics[height=3cm, width=3cm]{example-image-duck}\caption{Data Centre, Cloud}
\end{columns}
%\end{itemize}
\end{figure}
%\end{enumerate}
}
\end{frame}
\end{document}
Some other comments:
you don't need \usepackage{hyperref}, beamer already loads it
I'd be wary to use \hypersetup{urlcolor=blue} with beamer, this can lead to strange alternations to the carefully constructed colour themes of beamer in places one would never expect
If your tex distribution was updated within the last 5 years or so, you don't need \usepackage[utf8]{inputenc}, that's now the default
If you just want to change the font size of the caption, you don't actually need the caption package, beamer has its own mechanism to control the size of captions
Instead of \begin{frame}{...} I would use \frametitle{...}. That's much more flexible and powerful
If you specify both the width and height of your images, they will end up distorted. Please consider adding the keepaspectratio option to avoid this
to avoid manually repeating the same frame title several times ("Probleme heutiger Computer (3)") you could use overlays and add the slide in frame counter to the frametitle