tabular: vertical align minipage in table (top)

Question

I have a poster consisting of two columns. In one of the columns I have placed two figures next to each other. To get a nice tikz-frame around each figure I had to put them into minipages each (I did not managed to get just the tikz-frame around a figure working without a minipage...)

My problem is now, that I would like to have both elements [tikz-framed-figure] to be vertically aligned at the top. I tried to align it with tabular{x} but so far without success.

\documentclass[englisch,a0]{KITposter}
\usepackage[latin1]{inputenc}
\usepackage[english,ngerman]{babel}
\usepackage{multicol}
\usepackage{xcolor}
\usepackage[framemethod=tikz]{mdframed}
\usepackage{tabularx,booktabs} 
\usepackage{tikz}
\usetikzlibrary{backgrounds}

\begin{document}

\begin{tabularx}{\textwidth}[t]{cc}
  \begin{tikzpicture}
    \node[framed,double,ultra thick,draw=red,rounded corners=25pt] {
      \begin{minipage}[H]{.45\columnwidth}
        \begin{figure}
          \centering
          \includegraphics[width=0.95\textwidth]{./setup_1.pdf}
        \label{fig:setup_1}
        \end{figure} 
      \end{minipage}
    };
  \end{tikzpicture}
  &
  \begin{tikzpicture}
    \node[framed,double,ultra thick,draw=red,rounded corners=25pt] {
      \begin{minipage}[H]{.45\columnwidth}
      \begin{figure}
        \centering
        \includegraphics[width=0.95\textwidth]{./network_1.pdf}
        \label{fig:network_1}
      \end{figure} 
      \end{minipage}
  };
  \end{tikzpicture}
\end{tabularx}
\end{document}

edit

The solution suggested by Torbjørn (with a much more simplified structure without dead weight) works very well for me aligning the graphics within the tikz frames:

\documentclass{article}
\usepackage{graphicx}
\usepackage{tikz}
\usetikzlibrary{positioning}
\begin{tikzpicture}[myframe/.style={double,ultra thick,draw=red,rounded corners=25pt,inner sep=10pt}]
\node [myframe] (imga) {\includegraphics[width=0.42\textwidth]{example-image}};
\node [right=of imga.north east,anchor=north west,myframe] {\includegraphics[width=0.42\textwidth]{example-image-10x16}};
\end{tikzpicture}

Cheers and thanks for the help!

Answer 1

With tcolorbox

\documentclass{article}
\usepackage[many]{tcolorbox}
\begin{document}
    \begin{tcbraster}[raster columns=2,
        enhanced,
        raster force size=false,
        size=fbox,
        raster column skip=4mm,
        raster right skip= 0pt,
        raster left skip=0pt,
        raster valign=top,
        boxrule=2pt,arc=2mm,
        colframe=red,colback=blue!50!black,
        drop fuzzy shadow]
      \tcbincludegraphics[hbox,graphics options={width=0.42\linewidth}]{example-image-a}
      \tcbincludegraphics[hbox,graphics options={width=0.42\linewidth}]{example-image-10x16}
\end{tcbraster}
\end{document}

Answer 2

(My suggestion in the comment to LaRiFaRi's answer was a bit uncomplete, so here is a more complete answer.)

You can do this with a single tikzpicture, placing each image in a separate node. Instead of using the backgrounds library and modifying the style of the background rectangle, define a new style and apply this to each node. There is one addition of inner sep=10pt to keep the frame from covering the corners of the images.

The positioning is handled by the positioning library of TikZ. I set the second node to be right=of imga.north east, and then set anchor=north west. This means that the top of the two images are aligned.

The reason you got overlap is that you didn't use my code. You wrote right of= instead of right=of. See Difference between "right of=" and "right=of" in PGF/TikZ for an explanation of why that occurs

\documentclass{article}
\usepackage{graphicx}
\usepackage{tikz}
\usetikzlibrary{positioning}
\begin{document}    
    \begin{tikzpicture}[myframe/.style={double,ultra thick,draw=red,rounded corners=25pt,inner sep=10pt}]
    \node [myframe] (imga) {\includegraphics[width=0.42\textwidth]{example-image}};
    \node [right=of imga.north east,anchor=north west,myframe] {\includegraphics[width=0.42\textwidth]{example-image-10x16}};
    \end{tikzpicture}
\end{document}

Answer 3

Something like this?

% arara: pdflatex

\documentclass{article}
\usepackage[demo]{graphicx}
\usepackage{tikz}
\usetikzlibrary{backgrounds}
\usepackage{tabularx}
\newcolumntype{Y}{>{\centering\arraybackslash}X}    

\begin{document}    
\begin{tabularx}{\textwidth}[t]{YY}
    \begin{tikzpicture}[framed,background rectangle/.style={double,ultra thick,draw=red,rounded corners=25pt}] % change corner size to smaller values in order to prevent touching.
    \node{\includegraphics[width=0.42\textwidth]{./setup_1.pdf}
        %\label{fig:setup_1} % you do not need a label if there is no caption.
    };
    \end{tikzpicture}
    &
    \begin{tikzpicture}[framed,background rectangle/.style={double,ultra thick,draw=red,rounded corners=25pt}]
    \node{\includegraphics[width=0.42\textwidth]{./network_1.pdf}
        %\label{fig:network_1} % you do not need a label if there is no caption.
    };
    \end{tikzpicture}
\end{tabularx}
\end{document}