如果没有按顺序揭开，投影机中的透明度

Question

我想让整个幻灯片透明，直到完全揭开为止。但我并不一定按照书写顺序揭开它们（部分公式稍后显示）。我已按照之前的建议从和切换到\onslide。\pause但这 \uncover<1-+(-2),+->{}在下面的例子中不起作用，特别是对于\onslide<5->{xx}。

\documentclass{beamer}
\begin{document}
\setbeamercovered{transparent=10}
\begin{frame}
  \frametitle{Signals}\uncover<1-+(-2),+->{}
  \begin{itemize}[<+->]
    \item Informed investment banks receive an imperfect signal \textcolor<2-3>{red}{s} on the \textcolor<2-3>{blue}{return}:
    \item $\textcolor<3,6>{blue}{R}=\alert<3-4,6>{s}\onslide<5->{+\textcolor<5-6>{green}{\varepsilon}}$
    \item For uninformed investment banks it is $\textcolor<4>{red}{E\left[s\right]=\mu}$, $\textcolor<4,6>{red}{Var\left[s\right]=\sigma_S^2}$
    \item $\textcolor<5>{green}{E\left[\varepsilon\right]=0}$, $\textcolor<5,6>{green}{Var\left[\varepsilon\right]=\sigma_{\varepsilon}^2}$
    \item $\textcolor<6>{blue}{Var\left[R\right]}=\textcolor<6>{blue}{\sigma_R^2}=\textcolor<6>{red}{\sigma_S^2}+\textcolor<6>{green}{\sigma_{\varepsilon}^2}$\onslide<7>{}
  \end{itemize}
\end{frame}
\end{document}

Answer 1

您可以使用它\onslide<1-2,5->{...}来避免前两个覆盖层的双重透明度：

\documentclass{beamer}
\begin{document}
\setbeamercovered{transparent=10}
\begin{frame}
  \frametitle{Signals}\uncover<1-+(-2),+->{}
  \begin{itemize}[<+->]
    \item Informed investment banks receive an imperfect signal \textcolor<2-3>{red}{s} on the \textcolor<2-3>{blue}{return}:
    \item $\textcolor<3,6>{blue}{R}=\alert<3-4,6>{s}\onslide<1-2,5->{+\textcolor<5-6>{green}{\varepsilon}}$
    \item For uninformed investment banks it is $\textcolor<4>{red}{E\left[s\right]=\mu}$, $\textcolor<4,6>{red}{Var\left[s\right]=\sigma_S^2}$
    \item $\textcolor<5>{green}{E\left[\varepsilon\right]=0}$, $\textcolor<5,6>{green}{Var\left[\varepsilon\right]=\sigma_{\varepsilon}^2}$
    \item $\textcolor<6>{blue}{Var\left[R\right]}=\textcolor<6>{blue}{\sigma_R^2}=\textcolor<6>{red}{\sigma_S^2}+\textcolor<6>{green}{\sigma_{\varepsilon}^2}$\onslide<7>{}
  \end{itemize}
\end{frame}
\end{document}