# Align captions for unequal sized figures with subcaption package

I have two figures of unequal size (figure 1 is wider and shorter), and I would like to centre-align the two subfigures vertically, but keep the subcaptions aligned at the top (please see attached image). Can this be done with the subcaption package, without modifying the figures themselves? (figure updated)

%preamble
\usepackage[singlelinecheck=false, aboveskip=-3pt]{subcaption}
%document
%version1----
\begin{figure}
\captionsetup[subfigure]{labelformat=simple, position = top}
\captionsetup{font={onehalfspacing},skip=-10pt}
\subcaptionbox{}[0.5\textwidth]{\includegraphics[width=0.5\linewidth]{fig1.pdf}}
\subcaptionbox{}[0.5\textwidth]{\includegraphics[width=0.5\linewidth]{fig2.pdf}}

\end{figure}
\clearpage
%version2----
\begin{figure}[hb]
\captionsetup[subfigure]{labelformat=simple}
\captionsetup{font={onehalfspacing},skip=-10pt}
\begin{subfigure}[c]{0.49\textwidth}
\caption{}
\includegraphics[width=\textwidth]{fig1.pdf}
\end{subfigure}
\begin{subfigure}[c]{0.49\textwidth}
\caption{}
\includegraphics[width=\textwidth]{fig2.pdf}
\end{subfigure}

• Does the following answer your question? Subcaption: Vertical alignment of two images of different vertical size – leandriis Jul 24 '18 at 16:46
• Hi, I think that solution still centres the subcaption along with the subfigure, whereas I would like the subcaption to be at the top and the figure centred. I can already centre the figure with the [c] option for {subfigure}. I have updated the attached image to better reflect my question. Thanks. – srao Jul 25 '18 at 7:47

You might like this solution:

\documentclass{article}

\usepackage{graphicx}
\usepackage[singlelinecheck=false, aboveskip=-3pt]{subcaption}
\renewcommand{\thesubfigure}{\Alph{subfigure}}

\begin{document}

\begin{figure}[htbp]
\captionsetup[subfigure]{labelformat=simple}
\begin{subfigure}{\textwidth}
\valign{\hsize=0.49\hsize \linewidth=\hsize #\cr
\caption{}
\vfill
\includegraphics[height=2cm,width=\hsize]{example-image}
\vfill
\cr\noalign{\hfill}
\caption{}
\vfill
\includegraphics[width=\hsize]{example-image}
\vfill
\cr
}
\end{subfigure}

\end{figure}

\end{document}


• Great, this works! I am guessing \newsavebox{\subA} \newsavebox{\subB} in the preamble can be safely removed. – srao Jul 25 '18 at 13:44
• @srao Yes, they are a relic from a previous attempt. – egreg Jul 25 '18 at 14:01