LATEX comes with many packages, which define additional functions
for different applications. To use a package, one includes
the following command in the preambel:
\usepackage[OPTIONS]{PACKAGENAME}
The package graphicx allows to include postscript images into
a document. It works together with the driver programs that create
the document from the dvi file. If one uses the widespread
dvips driver, the package is included with
\usepackage[dvips]{graphicx}
The command
\includegraphics{IMAGE.PS}
includes the image IMAGE.PS at the given position. It uses the
internal size of the image. One can scale the image size with:
\includegraphics[width=10cm]{IMAGE.PS}
To scale an image with respect to the size of the text lines, one can
use the LATEX variable \textwidth:
\includegraphics[width=0.90\textwidth]{IMAGE.PS}
A simple way to produce a postscript file from any Windows program
is to print an image into a file, using an appropriate printer
driver. Unfortunately almost all printer drivers insert additional
information that can only be understood by the proper printer,
leading to scrambled postscript files. An exception is the
Adobe Postscript Driver,
which produces correct postscript files.