You haven't provided any specific details as to the image and page layout so I will describe a general technique that I use here. You can either split the image into two to achieve a centerfold or you can hide a portion of it, as is shown in the two images below, which I had on my hardisk from this answer.
Here is the MWE. You can use \hspace to move images left or right. If you have a single image, you let it overflow on the right (it will not show if it goes past the page) and on the next page, you insert it at the same position, but now with an \hspace*{-\textwidth} to pull it left. This way you do not need to slice the image before hand. If you care to explain in more detail as to the layout you want to achieve, I will extend the example and code. You should also have a look at LaTeX3 xcoffins.
\documentclass[a4paper]{article}
\usepackage[top=5mm,left=5mm,right=5mm,bottom=10mm]{geometry}
\usepackage{graphicx}
\usepackage{multicol}
\usepackage{lipsum}
\usepackage{caption}
\pagestyle{empty}
\begin{document}
\mbox{}
\clearpage
\vspace*{2\baselineskip}
\textbf{\LARGE FUN IN AMERICA}
\vspace*{0.8cm}
\begin{figure}[h] % can be left out
\hskip-0.5cm\includegraphics[width=1.055\textwidth]{./graphics/funinamerica}\\[-17pt]
\hfill{\tiny\bf Fun in America from a page spread in Life Magazine circa 1940's. \quad}\hfill\hfill\\
\par\bigskip
\centerline{\LARGE\bf AMERICANS ARE HAVING FUN}
\end{figure} % can be left out but do adjust spacing as needed
\unskip
\begin{multicols}{2}
\setlength{\linewidth}{0.3\textwidth}
\lipsum[1]
\end{multicols}
\clearpage
\vspace*{-2pt}
\begin{minipage}[c]{0.33\textwidth}
\hskip-1cm\includegraphics[width=\textwidth]{./graphics/funinamerica01}\\[3pt]
\hskip-1.5cm\begin{minipage}{4.7cm}
\footnotesize \textbf{AIRING} in Central Park during the 1860s was favorite Sunday diversion for rich New Yorkers who, between 4 and 5 o'clock, turned out in fashionable carriages for trot around the 10 miles of park roads.
\end{minipage}
\end{minipage}\hspace{20pt}
\begin{minipage}[c]{0.5\textwidth}
\hskip-0.5cm\begin{minipage}[c]{\textwidth}
\vspace{1cm}
\includegraphics[width=\textwidth]{./graphics/pologrounds}\\
\footnotesize\textbf{PROFESSIONAL BASEBALL} was well launched by 1880s and teams like Giants were publicised by huge posters used grounds of New York Polo Club (above) unil 1889, then moved further uptown.
\end{minipage}
\vskip5pt
\hskip25pt\begin{minipage}[t]{\textwidth}
\includegraphics[width=\textwidth]{./graphics/amusementpark}\\[-17pt]
\captionof*{figure}{\footnotesize \textbf{AMUSEMENT PARK}, called Elysioan Fields, in Hoboken, NJ. sported a hand-operatedpleasure railway with tiny carriages for 6c visitors could ride the railway, row boats and swing in a big gondola.}
\end{minipage}
\vskip5pt
\hskip-0.5cm\begin{minipage}[t]{\textwidth}
\includegraphics[width=8cm]{./graphics/tippling}\\
\begin{minipage}[t]{8cm}\footnotesize \textbf{TIPPLING} is varying degrees was pastine from coast to frontier. New York rendevous was Gem Saloon where gentlemen in top hats should shake hands with mayor and swill down oysters and flips.\end{minipage}\vspace{-1cm}
\end{minipage}
\end{minipage}
\end{document}
Simpler images and code is possible, as shown below.
\minipage{\textwidth}
\includegraphics[height=\textheight]{./graphics/firesidecomfort}
\endminipage
\hspace*{-1\textwidth}\minipage[t]{\textwidth}\includegraphics[height=\textheight]{./graphics/firesidecomfort}
\endminipage
Since we size the image on the \textheight the image overflows to the right. Then the only thing we need to do on the following page is to pull it by \textwidth. Amazingly simple and powerful.
