\chapter{Images}

\section{To Convert a PDF to an Image}

\lettrine[]{U}{se} the \texttt{pdftoppm} command (from the \label{poppler-utils} \texttt{poppler-utils}\index{poppler-utils} package) to convert part or all of a pdf to an image. For example, to convert a pdf to a png: 

\begin{Verbatim}[]
pdftoppm input.pdf output -png
\end{Verbatim}

This will convert each page in the pdf to a png using the format ``output-01.png'' where ``01'' is the page number. To convert a single page of a multipage pdf, use the \texttt{-f} flag to specify which page to use. For example, this will convert page 5 to a png:

\begin{Verbatim}[]
pdftoppm input.pdf output -png -f 5 -singlefile
\end{Verbatim}

To convert a range of pages, use the \texttt{-f} flag to specify the first page to convert and use the \texttt{-l} flag to specify the last page of the range:

\begin{Verbatim}[]
pdftoppm input.pdf output -png -f 5 \l 10 -singlefile
\end{Verbatim}

The default resolution is 150 dpi. To change this, use the \texttt{-rx} flag to specify the resolution along the x-axis, and the \texttt{-ry} flag to specify the resolution along the y-axis;

\begin{Verbatim}[]
pdftoppm input.pdf output -png -rx 300 -ry 300
\end{Verbatim}

Doubling the resolution along both axes will increase the file size by an approximate factor of four, and will also increase the amount of detail in the image.

\section{To Extract Images from a PDF File}

\lettrine[findent=0mm]{T}{o} extract images from a pdf file, use the \texttt{pdfimages} command (also from the same package\index{poppler-utils} mention in \S \ref{poppler-utils} ). 

\section{This is just a test}

And this is just some text.