Problem with an image

Question

I have a template for my project and I don't know very much about LaTeX. It puts that for putting an image is:

\begin{figure}
\centering
% dummy figure replacement 
\begin{tabular}{@{}c@{}}
\rule{.5\textwidth}{.5\textwidth} \\
\end{tabular}
\caption{\label{fig:example}A figure}
\end{figure}

but I think that in this text is missing a command to insert the image like this: \includegraphics[width=0.7\textwidth]{mifigure} but if I put that, it does´t work.

also if I put \includegraphics without width=0.7\textwidth, the image appear too big to the side of the document.

(my image is inside a folder and it is .png)

Now I have another problem related to this.

In main.tex

\documentclass{MScthesisITEM}
\DeclareGraphicsExtensions{.pdf,.jpg,.png}
\graphicspath{{./figs/}}

In example chapter4.tex

\begin{figure}
\centering
% dummy figure replacement 
\begin{tabular}{@{}c@{}}
\rule{.5\textwidth}{.5\textwidth} \\
\end{tabular}
\caption{\label{fig:example}A figure}
\end{figure}

This shows a black image in the center of the document.

In my chapter.tex

\begin{figure}
\centering
% dummy figure replacement 
\begin{tabular}{@{}c@{}}
\rule{.5\textwidth}{.5\textwidth} \\
\includegraphics[width=.5\linewidth]{circuitpacket}
\end{tabular}

\caption{ Explanation...}
\label{fig:comparison_circuit}
\end{figure}

I obtained the black image and my image after the black image. How can I erase the black image?

Answer 1

If your images are in the same directory in which the input file exist, the following code should work. Please make a try by replacing example-image-a with your-image-filename. And make sure you compile with pdflatex rather than latex followed by dvips followed by ps2pdf.

\documentclass{article}
\usepackage{graphicx}
\begin{document}
\begin{figure}
\centering
\includegraphics[width=.5\linewidth]{example-image-a}
\caption{Hello Universe}
\label{fig:HelloUniverse}
\end{figure}
\end{document}

But if your images are in a sub directory subdir1, subdir2, etc, for example, then you need to specify the graphics path as follows.

\documentclass{article}
\usepackage{graphicx}
\graphicspath{{subdir1/}{subdir2/}}
\begin{document}
\begin{figure}
\centering
\includegraphics[width=.5\linewidth]{example-image-a}
\caption{Hello Universe}
\label{fig:HelloUniverse}
\end{figure}
\end{document}