3

I know this is similar to other questions. Other answers address either:

  1. Adding a transparent image
  2. Centering an image but I cannot find an answer with both.

With previous answers I can successfully make my image transparent OR centered, but not both. I've tried integrating methods for the two with no luck.

Here's the code I'm using on my introduction slide

\usepackage{tikz}

    \usebackgroundtemplate{ 
         \vbox to \paperheight
              {\tikz \node[opacity=0.2] 
                 {\vfil\hbox to \paperwidth
                     {\hfil\includegraphics[width=1.5in]{name.png}
                  \hfil}\vfil} ;  }
            }
Hans
  • 1,013
Dr. Beeblebrox
  • 197
  • 1
  • 2
  • 11
  • Does this help? http://tex.stackexchange.com/questions/74038/transparent-image-background-in-beamer – Matthew Leingang Apr 12 '13 at 15:29
  • That is the post from which I got the \tikz part of my above code. But the code in your link does not center the image. Using the code from that post my image is automatically flush left. – Dr. Beeblebrox Apr 12 '13 at 15:32

1 Answers1

7

Combining the work of Transparent image background in beamer and Image on full slide in beamer package, you can do something like:

\documentclass{beamer}
\usepackage{tikz}

\usebackgroundtemplate{%
\tikz[overlay,remember picture] \node[opacity=0.3, at=(current page.center)] {
   \includegraphics[height=\paperheight,width=\paperwidth]{example-image-a}};
}

\begin{document}

\begin{frame}
Background transparent image, centered on slide
\end{frame}

\end{document}

sample output

You have to compile twice to get the image centered.

Community
  • 1
Matthew Leingang
  • 44,937
  • 14
  • 131
  • 195
  • You also need to think of the aspect ratio. – kiss my armpit Apr 12 '13 at 16:06
  • @Karl'sstudents: good point. Back when I was doing a lot of beamer stuff I thought about a macro that would maximize the image size to fit the aspect ratio. But I never got around to it. – Matthew Leingang Apr 12 '13 at 16:33
  • Why do you need the remember picture option? – Herr K. Apr 12 '13 at 16:38
  • @Kevin: the remember picture key is useful when you want to mark a position on the page rather than within the picture. You can see it documented in Section 16.13.2 of the pgf v2.10 manual. – Matthew Leingang Apr 12 '13 at 16:42
  • @MatthewLeingang: I thought overlay is used for that purpose (as I understand it, overlay is like drawing a bounding box of zero dimension, so that the TikZ picture doesn't affect the positioning of other materials on the page). remember picture, according to the manual is used so that you can later on refer to nodes in the current picture. – Herr K. Apr 12 '13 at 16:49
  • @Kevin: If you download the example above and remove the remember picture key before compiling, the image doesn't show up on the current page at all. I see your point why it doesn't seem necessary, but it is necessary for this example at least. Perhaps remember picture is needed to refer to any remembered pictures, not just the current one? – Matthew Leingang Apr 12 '13 at 16:56
  • @MatthewLeingang: You're right. This does seem strange... – Herr K. Apr 13 '13 at 00:29