\documentclass{standalone}
\usepackage{graphicx}
\usepackage{psfrag}
\usepackage{amsmath}
\usepackage{color}
\begin{document}
%\begin{somepicture}
%\somedrawingcommands
%\end{somepicture}
	\psfrag{hDti}[B][B]{$\tfrac{1}{2}\Delta t_i$}
	\psfrag{hDtip}[B][B]{$\tfrac{1}{2}\Delta t_{i+1}$}
	\psfrag{wmid}[lt][lt]{\color{blue}$\tilde\omega_i$}
	\psfrag{wi-1}[lB][lB]{$\omega_{i-1}$}
	\psfrag{wi-05}[lb][lb]{$\omega_{i-\frac{1}{2}}$}
	\psfrag{wi}[lB][lB]{$\omega_{i}$}
	\psfrag{wi+05}[lb][lb]{$\omega_{i+\frac{1}{2}}$}
	\psfrag{wi+1}[lB][lB]{$\omega_{i+1}$}
	\psfrag{ti-1}[cB][cm]{$t_{i-1}$}
	\psfrag{ti-05}[cB][cm]{$t_{i-\frac{1}{2}}$}
	\psfrag{ti}[cB][cm]{$t_{i}$}
	\psfrag{ti+05}[cB][cm]{$t_{i+\frac{1}{2}}$}
	\psfrag{ti+1}[cB][cm]{$t_{i+1}$}
	
	\includegraphics[scale=0.5]{Geschwindigkeit_Konsistenz2.eps}
\end{document}
