figure dimension latex code example

Example 1: latex width figure

\documentclass{report}
\usepackage[english]{babel}
\usepackage{graphicx}

\begin{document}
\includegraphics[height=3cm]{example-image-b}
\includegraphics[width=5cm]{example-image-b}

\includegraphics[height=3cm, width=3cm]{example-image-b}
\includegraphics[height=3cm, width=6cm]{example-image-b}
\includegraphics[keepaspectratio,height=3cm, width=6cm]{example-image-b}
\end{document}

Example 2: latex landscape figure width

\includegraphics[width=\linewidth]{img.png}