I'm trying to include an image to my beamer using Tikz. The problem is that I don't find the code to position the image horizontally and vertically as well as being able to change its opacity.

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    Welcome to TeX.se. You haven't given us very much information to be able to help you. Can you edit your question to show a minimal compilable document that shows what you are trying to do? Are you using beamer? Is the image supposed to be a background image for all your slides? On positioning, see e.g. Beamer background image centered On setting opacity for an included image see Includegraphics: set image opacity. – Alan Munn Mar 3 at 22:21

Welcome to TeX-SE! Thanks for adding some code. Given that you load tikz and the calc library, I'd like to suggest

\begin{tikzpicture}[overlay,remember picture]
\node[opacity=0.5] at ($(current page.center)+(1,1)$)

enter image description here

With overlay,remember picture you can access and use absolute page coordinates, and with calc you can add coordinates, as illustrated.

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