Include pdf page in different geometry page

Question

For my thesis I have generated a big set of pdf images that I would like to include in the text. One of the images in particular is a full page pdf file that is larger than the margins used for the general document. The geometry is currently set as a4paper and it cannot be adapted since it is the obligatory style.

I am currently including the includepdf feature and this returns me the result displayed in the image. The problem that I am having is that I cannot fit the caption in the right place. Currently I am using vspace to set the location of the caption but when I go under a certain value it moves the caption to another page. I believe this has to do with the geometry on which the pages are made, hence I think that changing it for one page could do the trick. I, however, do not know how to achieve this.

Thanks a lot!

Answer 1

It is easier to overlay the margins than change them. (Don't forget to run this twice.)

\documentclass[a4paper]{article}
\usepackage{tikz}
\usepackage{lipsum}
\begin{document}
\begin{figure}[p]
  \begin{minipage}[c][\textheight][s]{\textwidth}
    \begin{tikzpicture}[remember picture, overlay]
    \node[inner sep=0pt] at (current page.center)
      {\includegraphics[height=\paperheight,width=\paperwidth]{example-image}};
% or (\includegraphics[page=1]{filename.pdf}}:
    \end{tikzpicture}
    \vfill\caption{Caption goes here}
  \end{minipage}
\end{figure}

\lipsum[1-8]
\end{document}

---

Here is a solution using \newgeometry. There were some interesting conflicts between \afterpage and \restoregeometry, and the only way I could get the page number onto the third page was to add it directly.

\documentclass[a4paper]{article}
\usepackage[showframe]{geometry}
\usepackage{afterpage}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{lipsum}% MWE only

\begin{document}
\afterpage{\clearpage
\newgeometry{left=0pt,right=0pt,top=0pt,bottom=0pt,nofoot}%
\noindent\rlap{\includegraphics[height=.999\textheight,width=.999\textwidth]{example-image}}%
% or \includegraphics[page=1]{filename.pdf}
\begin{minipage}[b]{\textwidth}
  \captionof{figure}{Caption goes here}
\end{minipage}%
\restoregeometry
\rlap{\raisebox{\dimexpr \topskip-\textheight-\footskip}[0pt][0pt]{\makebox[\textwidth][c]{\thepage}}}%
\vspace{-\baselineskip}}
\lipsum[1-16]
\end{document}