One subcaption for two subfigures

Question

I have the following code which outputs one subcaption for each subfigure:
begin{figure}[]
  centering
  subcaptionbox{image 1}%
    {includegraphics{image1.png}hspace{0.5cm}
  subcaptionbox{image 2}%
    {includegraphics{image2.png}}%

bigskip

subcaptionbox{image 3}}%
    {includegraphics{image3.png}}hspace{0.5cm}
  subcaptionbox{image 4}%
    {includegraphics{image4.png}}%
  caption{Four images.}
end{figure}

Is it possible to modify it to have one subcaption for images 1 and 2 and another subcaption for images 3 and 4?

Torbjørn T. · Accepted Answer

Yes, just place two images in each subcaptionbox.

documentclass{article}
usepackage[demo]{graphicx} % the demo option replace images with black boxes
usepackage{subcaption}
begin{document}
begin{figure}
  centering
  subcaptionbox{image 1 and 2}%
    {includegraphics{image1.png}hspace{0.5cm}includegraphics{image2.png}}%

bigskip

subcaptionbox{image 3 and 4}%
    {includegraphics{image3.png}hspace{0.5cm}includegraphics{image4.png}}%
  caption{Four images.}
end{figure}
end{document}

Himanshu Maheshwari · Answer

I think an easier method is to start a subfigure environment and just put the caption after the first and second image instead of making subcaption box.
begin{figure}[h]
  centering
  begin{subfigure}{textwidth}
        includegraphics[width=0.49textwidth]{image1.png}
        hspace{1cm}
        includegraphics[width=0.49textwidth]{image2.png}
        caption{Image 1 and 2}
        label{fig:1-2}
  end{subfigure}
 hspace{0.5cm}
  begin{subfigure}{textwidth}
        includegraphics[width=0.49textwidth]{image3.png}
        hspace{1cm}
        includegraphics[width=0.49textwidth]{image4.png}
        caption{Image 3 and 4}
        label{fig:3-4}
  end{subfigure}
end{figure}

One subcaption for two subfigures

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