i'm having an paging problem including a two-column large image inside a three-column text page. I tried with the code:
\documentclass[]{book}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\graphicspath{{./Immagini/}}
\usepackage[utf8]{inputenc}
\usepackage[italian]{babel}
\usepackage{geometry}
\geometry{a4paper,top=2cm,bottom=2cm,left=1.5cm,right=1.5cm}
\usepackage{multicol}
\addtolength{\columnsep}{1.5mm}
\usepackage{blindtext}
\pagestyle{empty}
\begin{document}
\begin{multicols}{3}
\blindtext[2]
\makebox[2\columnwidth][c]{\includegraphics[width=2\columnwidth, keepaspectratio]{rect3050}}
\blindtext[2]
\end{multicols}
\end{document}
Of corse the result is not what I want:

Of course I could choose the text to put in the third column using a code like:
\documentclass[]{book}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\graphicspath{{./Immagini/}}
\usepackage[utf8]{inputenc}
\usepackage[italian]{babel}
\usepackage{geometry}
\geometry{a4paper,top=2cm,bottom=2cm,left=1.5cm,right=1.5cm}% margini
\usepackage{multicol}
\addtolength{\columnsep}{1.5mm}% spazio tra le colonne
\usepackage{blindtext}
\pagestyle{empty}
\begin{document}
\begin{multicols}{3}
\blindtext
\end{multicols}
\begin{multicols}{3}
\makebox[2\columnwidth][c]{\includegraphics[width=2\columnwidth, keepaspectratio]{rect3050.png}}
\phantom{a}
\columnbreak
\phantom{a}\\\phantom{a}
\columnbreak
\blindtext
\end{multicols}
\begin{multicols}{3}
\blindtext
\end{multicols}
\end{document}
But the result is still not what I want because the text is not continuous in the three sections that are created.

I also tried with the ambient 'floatfigure' but with no satisfying result because the package is thought for figures smaller than the width of the text in which they appear.
The result that i'd like to obtain is something like this:
Is unnecessary to specify that I want the text to be continuous 1,2,3,4,5...
\documentclass{...}, the required\usepackage's,\begin{document}, and\end{document}. That may seem tedious to you, but think of the extra work it represents for TeX.SX users willing to give you a hand. Help them help you: remove that one hurdle between you and a solution to your problem. – Henri Menke May 08 '14 at 14:02I changed my post improving the code and changing images (because of copyright).
Hope somebody can help me soon!..:)
– Giulio Camilla Polacco May 09 '14 at 12:22