latex - 投影仪中的半透明图形（pdflatex）

Question

我正在尝试使用带有数字的叠加层来避免为每张幻灯片创建不同的图像。覆盖适用于我包含的任何文本，但不适用于数字。例如：

\setbeamercovered{dynamic}
\begin{figure}\resizebox{10.0cm}{!}{
        \includegraphics{problem-a.pdf}
        Test A
        \pause
        \includegraphics{problem-b.pdf}
        Test B
        \pause
        \includegraphics{problem-c.pdf}
        Test C
}\end{figure}

在第一张幻灯片上，文本“Test B”和“Test C”中的结果用阴影表示，但与“problem-b”和“problem-c”对应的数字没有阴影。

Answer 1

对于任何偶然发现这一点的人，到目前为止我发现的最好的事情是使用 tikz 并设置自定义透明度模式：

\gdef\transparent@value{100}
\newcommand{\getbeamertrans}{
    \transparent@value/100
}
\newcommand{\set@transparent}[1]{\gdef\transparent@value{#1}}
\def\opaquenessCustom#1{%
\only<1->{%
  \beamer@actions{%
    \set@transparent{#1}%
    \expandafter\xdef\csname beamer@oldcolorhook%
    \the\beamer@coveringdepth\endcsname{\beamer@colorhook}%
    \expandafter\xdef\csname beamer@oldpgfextension%
    \the\beamer@coveringdepth\endcsname{\beamer@pgfextension}%
    {\globalcolorstrue\colorlet{beamer@freeze\the\beamer@coveringdepth}{bg}}%
    \xdef\beamer@colorhook{!#1!beamer@freeze%
      \the\beamer@coveringdepth\beamer@colorhook}%
    \gdef\beamer@pgfextension{!#1opaque}%
    \color{.}%
  }%
  {%
    \set@transparent{100}%
    \xdef\beamer@colorhook{\csname beamer@oldcolorhook%
      \the\beamer@coveringdepth\endcsname}%
    \xdef\beamer@pgfextension{\csname beamer@oldpgfextension%
      \the\beamer@coveringdepth\endcsname}%
    \color{.}%
  }}%
}%
\define@key{beamer@mixin}{transparent}[15]{%
    \def\beamer@uncoverbeforeactions{\ignorespaces\opaquenessCustom{#1}}%
    \def\beamer@uncoverafteractions{\ignorespaces\opaquenessCustom{#1}}%
}
\newcommand{\BeamerGraphic}[1]{%
    \begin{tikzpicture}%
        {\node[opacity=\getbeamertrans] {\includegraphics{#1}};}%
    \end{tikzpicture}%
}

Answer 2

另一种方法可能是用半透明形状临时覆盖图像：

\documentclass{beamer}
\usepackage{tikz}
\setbeamercovered{dynamic}

\begin{document}

\begin{frame}

\begin{figure}
    \includegraphics[width=2cm,page=1]{example-image-duck}
    Test A
    \pause
    \begin{tikzpicture}
    \node[anchor=south west,inner sep=0] (B) at (4,0) {\includegraphics[width=2cm,page=2]{example-image-duck}};
    \only<1>{%
        \fill [draw=none, fill=white, fill opacity=0.7] (B.north west) -- (B.north east) -- (B.south east) -- (B.south west) -- (B.north west) -- cycle;
    }
    \end{tikzpicture}
    Test B
    \pause  
     \begin{tikzpicture}
        \node[anchor=south west,inner sep=0] (B) at (4,0) {\includegraphics[width=2cm,page=3]{example-image-duck}};
        \only<1-2>{%
            \fill [draw=none, fill=white, fill opacity=0.7] (B.north west) -- (B.north east) -- (B.south east) -- (B.south west) -- (B.north west) -- cycle;
        }
     \end{tikzpicture}  
    Test C
\end{figure}
\end{frame}

\end{document}

Answer 3

我做了以下类似的事情：

\begin{figure}
                \includegraphics<1->{problem-a.pdf}
                \onslide<1->{Test A}                    
                \includegraphics<2->{problem-b.pdf}
                \onslide<1->{Test B}
                \includegraphics<3->{problem-c.pdf}
                \onslide<1->{Test C}
\end{figure}

也许它对你有用

Answer 4

您可以在本文档中找到有关在 pdflatex 中使用导入图形的更多信息。查找第 12 章：“叠加两个导入的图形”。