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For a poster, I would like to have an image fill the whole page. This image is supposed to be drawn within a tikz environment as my other content. However, graphicx seems to fail at rescaling when the image aspect ratio is much different fom the paper aspect ratio. My code reads:


% draw generic background
\draw[white,line width=0pt] (-.5\textwidth, -.5\textheight) rectangle (.5\textwidth, .5\textheight);
% draw image

I use the background to fill the whole page with a tikz environment so that (0,0) is at the center of the page and I can position other tikz objects as needed. As long as I use images which closely fit the page or if I use the command includegraphics[width=\textwidth,height=\textheight,keepaspectratio], the image gets scaled correctly. Otherwise, I get a blank first page and my content is on the second page. In other words, the image does not fit the page size, it is too large! How can I prevent this error from happening? Or is there even a better way to draw the image from within the tikz environment?

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Add [overlay] tikz option. – JLDiaz Mar 8 '13 at 15:22
I do not understand, why one should define width and height depending on \textwidth and \textheight with the flag to keep the aspectratio. This might cause problems to my understandings. – Dominikus K. Mar 8 '13 at 15:28
This is a common approach as for example shown here: How to fit a large figure to a page – Arnold Meister Mar 8 '13 at 15:59
up vote 5 down vote accepted

Here is a simple solution without \pgftext (don't mix pgf and TikZ) and margin=0cm, and using the remember picture and overlay option, the special current page node and \paperwidth x\paperheight:

\begin{tikzpicture}[remember picture,overlay]
% draw image
\node[inner sep=0] at (current page.center)
share|improve this answer
Thanks, this seems to work for the picture. But I cant figure out how to draw my background now. Also the 'overlay' option might get me into trouble since I am using tikzpictures inside tikzpictures for which the overlay option should be off. – Arnold Meister Mar 8 '13 at 15:58
Figured out the answer: \draw[white,line width=0pt] (current page.south east) rectangle (current page.north west); works to draw the background. – Arnold Meister Mar 8 '13 at 16:06
Actually, everything seems to work fine. I only had to change my placing coordinates. Thanks! Overlay is the key here. Just one more question: Why is it bad to mix pgf and tikz? (I also use pgfplots without any problems) – Arnold Meister Mar 8 '13 at 16:24
@ArnoldMeister A mix between pgf and TikZ is not bad if you know what you do... The PGF directives are not at the same level that the TikZ directives. – Paul Gaborit Mar 8 '13 at 16:53

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