How to \input or \include files from different directories?

Question

My folder structure looks like that:

---

While putting the chapters into the base file Report.tex works completely fine I get trouble when I try to insert the graphics into the chapters.

For example: How can I put the file Image_1 into Chapter_1.tex? As you can see the target file Image_1 is located in a neighboured directory of Chapter_1.tex.

Some command in Chapter_1.tex like...

\includegraphics[blabla]{../Graphics/Image_1}

... leads to the error "! LaTeX Error: File `../Graphics/Image_1' not found."

---

Minimum Working Examples (MWE):

For file Report.tex in root directory:

\documentclass{book}

\usepackage{graphicx}
\usepackage{blindtext}

\begin{document}

    \input{Chapters/Chapter_1}

    \input{Chapters/Chapter_2}

    \input{Chapters/Chapter_3}

\end{document}

For file Chapter_1.tex in subdirectory Chapters:

\chapter{First chapter}

\blindtext

\includegraphics{../Graphics/Image_1}

For file Image_1.tex in subdirectory Graphics:

\includegraphics{example-image-golden}

---

Do you have any ideas how to cross-input files from parallel directories? Thank you very much!

Answer 1

Files that are \input need to use a path relative to the root file (the one containing \documentclass) not to the included file, so you need to use

\includegraphics{Graphics/Image_1}

instead of

\includegraphics{../Graphics/Image_1}

It's probably simpler to use \graphicspath in the root file so you don't have to worry about the paths:

\graphicspath{{Graphics/}}

or if you have sub-directories within Graphics:

\graphicspath{{Graphics/}{Graphics/subDir1/}{Graphics/subDir2/}}

then you just need to use

\includegraphics{Image_1}