Problems with watermark using background package

Question

I want to place my image as a watermark at every page. Here's what I do in preamble:

\backgroundsetup{
    scale=1.5,
    angle=0,
    firstpage = true, 
    opacity=0.1, 
    contents = {
        \begin{tikzpicture}
            \node at ([yshift = 0pt, xshift = 0pt] current page.center){
                \includegraphics{shkolkovoLogo}
            }
        \end{tikzpicture}
    }
}

which gives me this:

But I have two problems:

As soon as I have done it I saw this in my log

Strange thing, because everything was okay until I placed this watermark.

The watermark's opacity on the first page is somehow greater than on the others. Here's a photo of the first page

as you can see it's a bit different than what is shown on the very first picture. What could be the reason of these things happen? Thank you in advance!

MWE, but it has a lot of errors on the last line

\documentclass{article}
\usepackage{background}
\usepackage{tikz}
\usepackage{pgfplots}
\usepackage{lipsum}
\usepackage{graphicx}

\backgroundsetup{
    scale=1.5,
    angle=0,
    firstpage = true, 
    opacity=0.1, 
    contents = {
        \begin{tikzpicture}
            \node at ([yshift = 0pt, xshift = 0pt] current page.center){
                \includegraphics{example-image-duck};
            }
        \end{tikzpicture}
    }
}  

\begin{document}
    \lipsum[1-150]
\end{document}

well read the error message: you forgot a semicolon at the end of the node. (I wouldn't use the background package and a tikzpicture to insert a simple graphic, you can do that directly with the shipout/background hook, see e.g tex.stackexchange.com/a/604943/2388). — Ulrike Fischer
– Ulrike Fischer, Commented Sep 19, 2022 at 13:55
I tried to place semicolon, but it doesn't change anything. I saw the link you added, but unfortunately I don't really understand how to do it. Would you be so kind to explain what does this shipout/background do and how to use it? — Daniel Neskorodov
– Daniel Neskorodov, Commented Sep 19, 2022 at 14:21
Did you add the semicolon after \node at ([yshift = 0pt, xshift = 0pt] current page.center){ \includegraphics{shkolkovoLogo} } ;? It is also possible that some errors stem from other parts of your document. You should always provide a minimal working example (MWE) that starts with \documentclass and ends with \end{document} so that others can compile it. — Jasper Habicht
– Jasper Habicht, Commented Sep 19, 2022 at 15:09

hpekristiansen · Accepted Answer · 2022-09-19 17:02:39Z

\documentclass{article}
\usepackage{background}
\usepackage{tikz}
\usepackage{lipsum}

\backgroundsetup{
scale=1.5,
angle=0,
firstpage=true,
opacity=0.1,
contents={
\begin{tikzpicture}
\node at ([xshift=0pt, yshift=0pt] current page.center){\includegraphics{example-image-duck}};
\end{tikzpicture}
}}
\begin{document}
\lipsum[1-5]
\end{document}

Edit: For me it seem that there is a bug in the background package. In the documentation it says:

firstpage= This boolean option allows the user to specify, setting the value true, that the background material must be displayed only in the first page of the document. The deafulat value is false.

What really happens is that the material is placed on all pages independent of this option. -and It seems that the material is placed twice on the first page, if the option is true. -making the first page less opaque.

In your case, you can just keep the option with the default false like this:

\documentclass{article}
\usepackage{background}
\usepackage{lipsum}
\backgroundsetup{
scale=1.5,
angle=0,
contents={\includegraphics{example-image-duck}}
}
\begin{document}
\lipsum[1-150]
\end{document}

Thank you very much! I feel so stupid that I just put the semicolon the wrong place... But do you have any idea why opacity on the first page is different compare to other pages? — Daniel Neskorodov
– Daniel Neskorodov, Commented Sep 19, 2022 at 15:46

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