Tu das Bild in irgendeine andere Variable und verschieb es dann wohin du willst. Hier z.B. mit fromlogo:
Code:
\documentclass[%
version=last,%
firstfoot=off,%
firsthead=on,
fromlogo,
%addrfield=backgroundimage,%
%addrfield=on,%
backaddress=true%
]%
{scrlttr2}%
\usepackage{graphicx}
\usepackage[ngerman]{babel}%
\setkomavar{date}{\today}%
\setkomavar{fromname}{M.M}%
\setkomavar{signature}{M.M}%
\setkomavar{fromaddress}{Musterstra{\ss}e 4\\%
11111 Berlin}%
\setkomavar{place}{Berlin}%
\makeatletter
\setkomavar{fromlogo}{%
\unitlength1mm
\begin{picture}(0,0)\put(-50,-30){\rule{2cm}{2cm}}\end{picture}}
\begin{document}%
\begin{letter}{Nils Mustermann\\
Musterstrasse 4\\
Berlin}%
\opening{Hallo,}
texttext
\closing{Mit freundlichen Gr\"u{\ss}en}%
\end{letter}%
\end{document}
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