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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.

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up vote 6 down vote accepted

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



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

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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
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