floats
I want to make a figure composed of two images that have different sizes. I want to put them side by side so that they have the same height and that they overall take, say, 90% of the line width.
It is easy to make them have the same fixed height (say in cm), but how to let this common height be automatically adjusted to fulfill the desired overall width? Manual trial-and-error is time-consuming, approximate and non robust.
A solution with or without subfigure or another LaTeX package is OK.
Try putting the subfigure inside a minipage, see below,
\begin{figure}
\centering
\begin{minipage}{0.5\textwidth}
\subfigure[comment]{\includegraphicsJustified{images/img1.png} }
\subfigure[comment]{\includegraphicsJustified{images/img2.png} }
\end{minipage}
\caption{whole comment}
\end{figure}
I firmly believe that you can carry out the rest of the fine tuning.
For further details, please see http://www.tex.ac.uk/cgi-bin/texfaq2html?label=errmissitem.
Hope this helps.
Slightly adopted @egreg answer in given link (that now you have two figures and not sub-figures):
\documentclass{article}
\usepackage{graphicx}
\usepackage{subcaption}% added for test in parallel with @egreg solution
\usepackage{showframe}% only for show page layout. in real use it had to be omitted!
% new lengths and save boxes
\newlength{\twosubht}
\newsavebox{\twosubbox}
\newlength{\firstfig}
\newsavebox{\firstfigbox}
\newlength{\secondfig}
\newsavebox{\secondfigbox}
\begin{document}
\begin{figure}[htp]
% measurement of height
\sbox\twosubbox{\resizebox{\dimexpr.9\textwidth-1em}{!}{%
\includegraphics[height=3cm]{example-image-a}%
\includegraphics[height=3cm]{example-image-16x9}%
}%
}
\setlength{\twosubht}{\ht\twosubbox}
% measurement of width
\sbox\firstfigbox{\includegraphics[height=\twosubht]{example-image-a}}%
\setlength{\firstfig}{\wd\firstfigbox}
\sbox\secondfigbox{\includegraphics[height=\twosubht]{example-image-16x9}}%
\setlength{\secondfig}{\wd\secondfigbox}
% figure
\centering
\begin{tabular}{p{\firstfig}p{\secondfig}}
\usebox\firstfigbox
\caption{The first}
& \usebox\secondfigbox
\caption{The second}
\end{tabular}
\end{figure}
% original @egreg solution
\noindent\hrulefill The text width\hrulefill
\begin{center}
\makebox[.9\textwidth]{\hrulefill 90\% of text width\hrulefill}
\end{center}
\begin{figure}[htp]
% preliminary
\sbox\twosubbox{%
\resizebox{\dimexpr.9\textwidth-1em}{!}{%
\includegraphics[height=3cm]{example-image-a}%
\includegraphics[height=3cm]{example-image-16x9}%
}%
}
\setlength{\twosubht}{\ht\twosubbox}
% typeset
\centering
\subcaptionbox{First\label{f}}{%
\includegraphics[height=\twosubht]{example-image-a}%
}\quad
\subcaptionbox{Second\label{s}}{%
\includegraphics[height=\twosubht]{example-image-16x9}%
}
\caption{The caption}
\end{figure}
\end{document}
First compiling is slow due to figure size adjustment and figure size measurements.
Edit: For comparison the size of the figures, I copy @egreg solution from given link into my answer. As expected, the size of figures are the same (this is response to comment, that figures are not the same ...).
I also recommended to use geometry package for determining page layout (no used in above MWE).
Best Answer
You can include them to the same (more or less arbitrary) height then scale them together to the desired width