Weird image filenames

Question

It was a pleasant surprise for me to find out that it is possible to include image named “K_{2,3}.pdf” into TeX document using \includegraphics (and pdfLaTeX).

\documentclass{article}
\usepackage{graphicx}

\newcommand{\namedpicture}[1]{\begin{figure}\centering\includegraphics{#1}\caption{$#1$}\end{figure}}

\begin{document}
    \pagestyle{empty}
    \namedpicture{K_{2,3}}
\end{document}

Now I have a question, which doesn't seem to have practical meaning, but is still interesting:) Is it possible to include picture with name containing % or imbalanced figure brackets? I. e. I have files %.pdf, {.pdf and }.pdf. How to include any of them?

Answer 1

If you are expecting only including such files, not automating such a process, the answer is YES. In the following we assume, that angle brackets do not appear in the names of the files and the captions are manually inserted.

\documentclass{article}
\usepackage{graphicx}

%\newcommand{\namedpicture}[1]{\begin{figure}\centering\includegraphics{#1}\caption{$#1$}\end{figure}}

\begin{document}
\pagestyle{empty}
 %   \namedpicture{K_{2,3}}
\begin{figure}\centering\includegraphics[width=20mm]{K_{2,3}}\caption{$K_{2,3}$}\end{figure}

\catcode`\%=12
\begin{figure}\centering\includegraphics[width=20mm]{%}\caption{\%}\end{figure}
\catcode`\%=14

\catcode`\<=1
\catcode`\>=2
\catcode`\{=12
\catcode`\}=12
\begin<figure>\centering\includegraphics[width=20mm]<{>\caption<\{>\end<figure>

\begin<figure>\centering\includegraphics[width=20mm]<}>\caption<\}>\end<figure>

\catcode`\<=12
\catcode`\>=12
\catcode`\{=1
\catcode`\}=2

\end{document}