how to fit a whole picture on page in latex
newlength{textundbildtextheight}
newcommand{textundbild}[2]{
settototalheighttextundbildtextheight{vbox{#1}}
#1
vfill
begin{center}
includegraphics[width=textwidth,keepaspectratio=true,height=textheight-thetextundbildtextheight]{#2}
end{center}
vfill
}latex full width image two column
onecolumn
begin{figure}[H]
includegraphics{arc}
end{figure}
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