用PDF（使用pdfpages套件）覆蓋背景影像（使用background套件）

Question

我只是想看清楚PDF。有沒有辦法使用 pdfpages 套件透過 PDF 覆蓋背景圖像（jpg 檔案）？或是有沒有辦法單獨使用PDF的不透明度？

\documentclass{book}
\usepackage{graphicx}
\usepackage[paperwidth=11.7in, paperheight=8.3in]{geometry}
\usepackage{background}
\usepackage{pdfpages}

\backgroundsetup{
position={5.4125in,-3.5in},
scale=.9,
angle=-.5,
opacity=0.2, 
contents={\includegraphics{ImageName}}
}

\begin{document}

\includepdf[pages=-]{filename}

\end{document}

Answer 1

這應該對你有用。請在評論中添加更多疑問，以便我可以根據要求對其進行增強：

\documentclass{article}
\usepackage[paperwidth=11.7in, paperheight=8.3in]{geometry}
\usepackage[pages=some]{background}
\usepackage{pdfpages}

\backgroundsetup{
scale=0.9,
opacity=0.2,
angle=-.5,
position={5.4125in,-3.5in},
contents={%
  \includegraphics[width=\paperwidth,height=\paperheight]{Small-mario.png}
  }%
}
\begin{document}
 \BgThispage
 \includepdf[pages=-]{Test2}
 \clearpage
\end{document} 

Answer 2

由於該background套件是基於 構建的tikz，特別是基於命令pdfpages構建的，因此您可以這樣做。graphicx\includegraphics

在tikzpicture環境中，使用環境將影像放在背景圖層上pgfonlayer。 pdf 可以透過將其放置在主圖層上來覆蓋背景圖像，這不必在程式碼中明確編寫。您可以將背景影像的不透明度設為您想要的任何值，而不會影響頂部 pdf 的可見度。這是針對帶有opacity=0.9、opacity=0.5和的三個背景圖像進行說明的opacity=0.1。

\documentclass[a4paper,10pt]{article}
\usepackage[showframe,margin=2.5cm]{geometry}
\usepackage{graphicx}
\usepackage{MWE} % for example-image-a.png and example-image-a4.pdf
\usepackage{tikzpagenodes} % for (current page text area.north)
\usetikzlibrary{backgrounds} % for {pgfonlayer}{background}

\pgfdeclarelayer{background}   % add the background layer
\pgfsetlayers{background,main} % specify the order of the layers

\begin{document}
\begin{tikzpicture}[remember picture, overlay]
% Put images in the background
\begin{pgfonlayer}{background}
\node[opacity=0.9,anchor=north] (A) at (current page text area.north) {\includegraphics[scale=0.5]{example-image-a}};
\node[opacity=0.5,below=3cm]  (B)   at (A.south) {\includegraphics[scale=0.5]{example-image-a}};
\node[opacity=0.1,below=3cm]  (C)   at (B.south) {\includegraphics[scale=0.5]{example-image-a}};
\end{pgfonlayer}
% Put an image in the main layer
\node at (current page text area.center) {\includegraphics{example-image-a4}};
\end{tikzpicture}

\end{document}