When I include graphics in my document, the colors are always converted to grayscale, which is very unfortunate as I depend on the colors in the images.
I use LaTeX => PS => PDF for creating my document. Here is a MWE:
\documentclass[11pt,oneside,a4paper]{scrartcl}
\usepackage{graphicx}
\DeclareGraphicsExtensions{.eps,.png,.pdf}
\graphicspath{{E:/.../images/}}
\begin{document}
\begin{figure}[ht!]
\centering
\includegraphics[bb=0 0 966 503,scale=0.4]{images/highlight}
\caption{Hervorgehobenes Bauteil}
\end{figure}
\end{document}
The following image is the result.

latex+dvipdfmand withpdflatex(after removing thebboption). I have no idea with editor/IDE you use and which commands it executes for LaTeX => PS => PDF. You could try to remove the PNG to EPS manually or simply usepdflatex(most likely called LaTeX => PDF for you). – Martin Scharrer May 31 '11 at 08:15