How to deal with relative paths in input files?

Question

Say I have a a file File1.tex that I input in a file like Foo.tex:

folder1/File1.tex:

\begin{frame}
    This is file 1.
\end{frame}

Foo.tex:

\documentclass{beamer}
\usepackage{graphicx}
\begin{document}
\input{folder1/File1.tex}


\end{document}

All works fine. But if I include a graphic in File1 the relative path does not work in `Foo.tex":

Say I add a file image1.jpg to folder folder1/images/.

Now I can extend folder1/File1.tex:

\begin{frame}
    This is file 1.
    \includegraphics{images/image1}
\end{frame}

But now, Foo.tex could not find the graphic, because of its point of view, the path of \includegraphics should be folder1/images/image1.

How can I manage such things?

Answer 1

You could either

1. Always type the directory starting from the position of Foo.tex, since the relative path in \includegraphics from an input file cannot be used anywhere anyways.

or

2. Declare all the possible image folders at the beginning of your main file using

...
\usepackage{graphicx)
\graphicspath{ {./folder1/images/}{./folder2/images/}... }
...

and later only specify the files' names

\includegraphics{image1}