# How to include a picture over two pages, left part on left side, right on right (for books)?

When writing a long book (from 300 to over a 1000 pages), there is often need to include large pictures and one wishes to have them displayed over two pages, left half on the left page, right half on the right page. If one cuts the picture in two halves and includes them both separately, there is a large possibility that they will not end up each on their respective page (i.e. next to each other).

If there are many many pictures to be added (from 50 to up to 200 pictures per book), splitting each picture in two halves manually is not acceptable, especially if a tiny change in font size shifts the whole document, resulting in a big mess with pictures: the left part now appears on the right page side and vice versa.

Question: How can I create a command

\twopagepicture{position = t or b}{width = l or p}{mypicture.jpg}

with the following properties:

• t ... top of page
• b ... bottom of page
• l ... line width
• p ... page width

the left half of the picture is displayed on the left page (nearest to the place/text where the command was called) and the right half on the NEXT (right) page.

For example \twopagepicture{t}{l}{mypicture.jpg} is supposed to do this:

And \twopagepicture{t}{p}{mypicture.jpg} is supposed to do this:

By the way, I'm using memoir with a lot of packages:

\documentclass[a4paper,twoside, openodd, final]{memoir}
\usepackage[english]{babel}
\usepackage[top=2.4cm, bottom=2cm, left=2cm, right=2cm]{geometry}
\usepackage{bookman}
\usepackage[pdfpagelayout=TwoPageRight]{hyperref}
\usepackage{longtable}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{verbatim}
\usepackage{color}
\usepackage{tabularx}
\usepackage{multirow}
\usepackage{wrapfig}
\usepackage{fancybox}
\usepackage{framed}
\usepackage{lettrine}
\usepackage{tocloft}
\usepackage{pdfpages}
\usepackage{watermark}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\renewcommand{\chapnamefont}{    \fontsize{10mm}{15mm}\selectfont \bfseries}        %%
\renewcommand{\chapnumfont}{     \fontsize{10mm}{15mm}\selectfont \bfseries}        %%
\renewcommand{\chaptitlefont}{   \fontsize{10mm}{15mm}\selectfont \bfseries}        %%
\renewcommand{\printchaptername}{\fontsize{10mm}{15mm}\selectfont \bfseries Chapter}%%
\renewcommand{\printchapternum}{\chapnumfont \thechapter}                           %%
\renewcommand{\afterchapternum}{. \\}                                               %%
\renewcommand{\afterchaptertitle}{\par\nobreak\medskip\hrule\vskip \afterchapskip}  %%
}    %definiramo izgled chapterjev (deluje samo v memoir class-u)                     %%
\chapterstyle{LOTRchapter}  %uporabimo pravkar definirani stil chapterjev                                           %%
%%------------------------------------------------------------------------------------------------------------------%%
\setlength{\parindent}{0.75cm}     %zacetni zamik paragrafov                                                        %%
\setlength{\parskip}{0ex}          %vertikalni razmik med paragrafi (stevilo vrstic)                                %%
%\par ... nov paragraf                                                           %%
\def\thechapter{\arabic{chapter}}  %stevilcenje chapterjev z arabskimi stevilkami                                   %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
\includepdf[pages={-}]{Cover.pdf}
\leftwatermark{ \put(-56.1,-795){\includegraphics[width=\paperwidth, height=\paperheight]{Background-22.jpg}}}
\rightwatermark{\put(-56.1,-795){\includegraphics[width=\paperwidth, height=\paperheight]{Background-11.jpg}}}

-
FYI, memoir already emulates tabularx and verbatim, and (with study) will eliminate your need for geometry and tocloft... –  Brent.Longborough Sep 14 '11 at 19:09

The following should do it. It needs at least two compiler runs to be stable. With a lot of floats it can take several compilation runs until the document is stable.

Works now for twoside mode; now with caption support; Added float settings and removed ! from the float position to also support smaller images; Moved p images to the page corners.

\documentclass[twoside]{book}

\usepackage{graphicx}
\usepackage{afterpage}
\usepackage{placeins}
\usepackage{xcolor}

% For the memoir class remove the following two packages.
% This class already provide the functionality of both
\usepackage{caption}
\usepackage[strict]{changepage}
%%%

\setcounter{totalnumber}{1}
\setcounter{topnumber}{1}
\setcounter{bottomnumber}{1}
\renewcommand{\topfraction}{.99}
\renewcommand{\bottomfraction}{.99}
\renewcommand{\textfraction}{.01}

\makeatletter
\newcommand*{\twopagepicture}[4]{%
\checkoddpage
\ifoddpage
\expandafter\@firstofone
\else
\expandafter\afterpage
\fi
{\afterpage{%
\if #1t%
\if #2p%
\thispagestyle{empty}%
\afterpage{\thispagestyle{empty}}%
\fi
\fi
\begin{figure}[#1]
\if #2p%
\if #1t%
\fi
\fi
\if #1b%
\caption{#4}%
\fi
\makebox[\textwidth][l]{%
\if #2p\relax
\let\mywidth\paperwidth
\hskip-\dimexpr1in+\hoffset+\evensidemargin\relax
\else
\let\mywidth\linewidth
\fi
\if #1b\else
\caption{#4}%
\fi
\if #2p%
\if #1b%
\fi
\fi
\end{figure}%
\begin{figure}[#1]
\if #2p%
\if #1t%
\fi
\fi
\makebox[\textwidth][l]{%
\if #2p%
\let\mywidth\paperwidth
\hskip-\dimexpr1in+\hoffset+\oddsidemargin\relax
\else
\let\mywidth\linewidth
\fi
\if #2p%
\if #1b%
\fi
\fi
\end{figure}%
}}%
}
\makeatother

\usepackage{lipsum}
\begin{document}
\lipsum
\lipsum
\twopagepicture{b}{l}{image}{Test}
\lipsum
\twopagepicture{t}{l}{image}{Test}
\lipsum
\twopagepicture{b}{p}{image}{Other test}
\lipsum
\twopagepicture{t}{p}{image}{Other test with
very very very very very very very very very very very
very very very very very very very very very very very
very very very very very very very very very very very
long caption
}
\lipsum
\lipsum

\end{document}


(The image shown is a panorama photo made by me from top of the Preikestolen mountain, Norway)

-
@Leon: Do you want the same caption on both sides? I think it should only be displayed on the first page. –  Martin Scharrer Jul 22 '11 at 23:40
@Leon: I added it now with the caption only at the first side. For bottom figures the caption is added a second time but as white text to ensure the correct alignment. –  Martin Scharrer Jul 22 '11 at 23:51
@Leon: For memoir simply remove the changepage and the caption package, then it should work fine! –  Martin Scharrer Jul 23 '11 at 1:40
Very nice. This might deserve a new package :-) –  ℝaphink Sep 14 '11 at 8:09
I second the idea of turning this into a new package. There is, however, one additional option I would like to see (and you had asked about in your first comment): The possibility to typeset long captions over both sides. IMHO this gives a smoother layout; furthermore I have several large facing-pages figures with long captions that otherwise do not fit on the pages. (I have achieved this more or less manually so far) –  Daniel Sep 14 '11 at 9:39

## protected by Martin Scharrer♦Sep 27 '11 at 8:27

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