7

I want to draw a thick red X over an image from a PNG file, as a part of a Tikz picture. How can this be done? The documentation regarding external images in PGF is a bit vague.

lockstep
  • 250,273
Little Bobby Tables
  • 14,755
  • See http://tex.stackexchange.com/questions/20792/how-to-superimpose-latex-on-a-picture or this one http://tex.stackexchange.com/questions/9559/drawing-on-an-image-with-tikz. – kiss my armpit Jan 14 '12 at 01:56

1 Answers1

10

Place the image in a node and use the node anchors to draw the cross

\documentclass{article}
\usepackage[demo]{graphicx}
\usepackage{tikz} 

\begin{document}

\begin{tikzpicture}
  \node (img) {\includegraphics{foo.png}};
  \draw[red, line width=1mm] 
    (img.south west) -- (img.north east)
    (img.south east) -- (img.north west);
\end{tikzpicture}

\end{document}
Martin Heller
  • 11,391
  • Thanks! I tried to do the same using \pgfuseimage, but apparently it does not get the bounding box right. – Little Bobby Tables Apr 17 '11 at 10:44
  • You can modify the extend to which the lines are going beyond the image using either the inner sep or outer sep option for the image \node. For example: inner sep=0pt,outer sep=0pt will make the cross exactly the size of the image. – Martin Scharrer Apr 17 '11 at 11:00