\message{ !name(pfg_test.tex)}\documentclass{article}
\usepackage{pgfplots}
\usepackage{filecontents}
\usepackage{subcaption}
\usepackage{adjustbox}
\usepackage{xcolor}
\usepackage{graphicx}
\usetikzlibrary{calc, 3d}

\begin{document}

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      \end{axis}
    \end{tikzpicture}
  \end{adjustbox}
  \caption{True position (\textcolor{red}{red}), distorted data (black)}
\end{figure}
\begin{center}
\begin{figure}[h]
  \begin{subfigure}{0.49\textwidth}
    \includegraphics[width=\textwidth]{Data/klammern.jpg}
    \caption{Original Picure}
  \end{subfigure}
  \begin{subfigure}{0.49\textwidth}
    \includegraphics[width=\textwidth]{Data/image_conv4.png}
    \caption{test}
  \end{subfigure}
  \begin{subfigure}{0.49\textwidth}
    \includegraphics[width=\textwidth]{Data/image_conv5.png}
    \caption{test}
  \end{subfigure}
  \begin{subfigure}{0.49\textwidth}
    \includegraphics[width=\textwidth]{Data/image_conv6.png}
    \caption{test}
  \end{subfigure}
\end{figure}
\end{center}

\begin{figure}
  \begin{adjustbox}{width=\textwidth}
    \begin{tikzpicture}  
      \begin{scope}[x = (0:1cm), y=(90:1cm), z=(15:-0.5cm)]
        \node[canvas is xy plane at z=0, transform shape] at (0,0)
        {\includegraphics[width=5cm]{Data/klammern_r.jpg}};
        \node[canvas is xy plane at z=2, transform shape] at (0,-0.2)
        {\includegraphics[width=5cm]{Data/klammern_g.jpg}};
        \node[canvas is xy plane at z=4, transform shape] at (0,-0.4)
        {\includegraphics[width=5cm]{Data/klammern_b.jpg}};
        \node[canvas is xy plane at z=4, transform shape] at (-8,-0.2)
        {\includegraphics[width=5.3cm]{Data/klammern_rgb.jpg}};
      \end{scope}
    \end{tikzpicture}
  \end{adjustbox}
  \caption{On the right the red, green and blue chanels of the picture
    are displayed. In order to better visualize the color channes the
    black and white picture of each channel has been colored in the
    respective color. Combining the layers results in the image on the
    left}
\end{figure}



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\end{document}

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