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....
\pgfplotsset{compat=newest,
	     every axis/.append style={font={\footnotesize}, /pgf/number format/use comma},
	     every axis label/.append style={sloped},
}
...
\begin{tikzpicture} \begin{axis}[view={120}{235}, width=0.4*\textwidth, xlabel=Shutter, ylabel=Gain, colorbar/width=0.3cm, colorbar horizontal, xtick=\empty, ytick=\empty, ztick=\empty] 
    \addplot3[mesh, shader=flat] file {Plots/ACamSGS.table};
\end{axis} \end{tikzpicture}
...

\documentclass{scrreprt}

%Schrift
\usepackage[ansinew]{inputenc}

%Anführungszeichen
\usepackage[ngerman]{babel}
\usepackage[babel,german=quotes]{csquotes}

%Grafik
\usepackage{graphicx}
\usepackage{wrapfig}
\usepackage[label font={small,sl},font={small,sl}, figurewithin=none]{caption}
\captionsetup[wrapfigure]{name=Abb.}
\captionsetup[figure]{name=Abb.}
\usepackage{float}
\usepackage{subfigure}
\usepackage{etex}
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{compat=newest,
	     every axis/.append style={font={\footnotesize}, /pgf/number format/use comma},
	     every axis label/.append style={sloped},
}

\begin{document}
 \begin{figure}[h]
\centering
\subfigure[$h(Gain, Shutter)$]{
\begin{tikzpicture} \begin{axis}[view={-30}{55},colorbar, width=0.4*\textwidth, xlabel=Shutter, ylabel=Gain, colorbar/width=0.3cm, colorbar horizontal, xtick=\empty, ytick=\empty, ztick=\empty] 
    \addplot3[mesh, shader=flat] file {NCamSGk.table};
\end{axis} \end{tikzpicture}
}
\end{figure}
\end{document}

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\begin{axis}[view={-30}{55},colorbar, width=0.4*\textwidth, xlabel=Shutter, ylabel=Gain, colorbar/width=0.3cm, colorbar horizontal, xtick=\empty, ytick=\empty, ztick=\empty,
       %
	point meta min=20,
	colorbar style={
		xtick={20,25},
	%	xmin=20,
	},
]
    \addplot3[mesh, shader=flat] file {P.dat};
\end{axis}