[latex] Latex - Change margins of only a few pages

I have a Latex document where I need to change the margins of only a few pages (the pages where I'm adding a lot of graphics).

In particular, I'd like to change the top margins (\voffset). I've tried doing:

\addtolength{\voffset}{-4cm}

% Insert images here

\addtolength{\voffset}{4cm}

but it didn't work. I've seen references to the geometry package, but I haven't found how to use it for a bunch of pages, and not for the whole document.

Any hints?

Use the "geometry" package and write \newgeometry{left=3cm,bottom=0.1cm} where you want to change your margins. When you want to reset your margins, you write \restoregeometry.

A slight modification of this to change the \voffset works for me:

\newenvironment{changemargin}[1]{
  \begin{list}{}{
    \setlength{\voffset}{#1}
  }
  \item[]}{\end{list}}

And then put your figures in a \begin{changemargin}{-1cm}...\end{changemargin} environment.

\par\vfill\break % Break Last Page

\advance\vsize by 8cm % Advance page height
\advance\voffset by -4cm % Shift top margin
% Start big page
Some pictures
% End big page
\par\vfill\break % Break the page with different margins

\advance\vsize by -8cm % Return old margings and page height
\advance\voffset by 4cm % Return old margings and page height

For figures you can use the method described here :
http://texblog.net/latex-archive/layout/centering-figure-table/
namely, do something like this:

\begin{figure}[h]
\makebox[\textwidth]{%
        \includegraphics[width=1.5\linewidth]{bla.png}
    }
\end{figure}

Notice that if you have subfigures in the figure, you'll probably want to enter into paragraph mode inside the box, like so:

\begin{figure}[h]
\makebox[\textwidth]{\parbox{1.5\textwidth}{ %
\centering
\subfigure[]{\includegraphics[width=0.7\textwidth]{a.png}}
\subfigure[]{\includegraphics[width=0.7\textwidth]{b.png}}
\end{figure}

For allowing the figure to be centered in the page, protruding into both margins rather than only the right margin.
This usually does the trick for images. Notice that with this method, the caption of the image will still be in the delimited by the normal margins of the page (which is a good thing).

I was struggling a lot with different solutions including \vspace{-Xmm} on the top and bottom of the page and dealing with warnings and errors. Finally I found this answer:

You can change the margins of just one or more pages and then restore it to its default:

\usepackage{geometry}
...
... 
...
\newgeometry{top=5mm, bottom=10mm}     % use whatever margins you want for left, right, top and bottom.
...
... %<The contents of enlarged page(s)>
...    
\restoregeometry     %so it does not affect the rest of the pages.
...
... 
...

PS:

1- This can also fix the following warning:

LaTeX Warning: Float too large for page by ...pt on input line ...

2- For more detailed answer look at this.

3- I just found that this is more elaboration on Kevin Chen's answer.

I had the same problem in a beamer presentation. For me worked using the columns environment:

\begin{frame}
  \begin{columns}
    \column{1.2\textwidth}
    \begin{figure}
      \subfigure{\includegraphics[width=.49\textwidth]{1.png}}
      \subfigure{\includegraphics[width=.49\textwidth]{2.png}}
    \end{figure}
   \end{columns}
\end{frame}

I could not find a easy way to set the margin for a single page.

My solution was to use vspace with the number of centimeters of empty space I wanted:

 \vspace*{5cm}                                                             

I put this command at the beginning of the pages that I wanted to have +5cm of margin.

Look up \enlargethispage in some LaTeX reference.