變更標題中的字體顏色

Question

我想知道如何更改簡報標題中的字體顏色？

我看見這裡如何更改欄的顏色但不更改實際字體。

原始碼：

\documentclass[xcolor=dvipsnames]{beamer}
 \usetheme{CambridgeUS}
 \useinnertheme{rectangles}
 \useoutertheme{infolines}

 \setbeamercolor{frametitle}{fg=Brown,bg=Brown!20}
 \setbeamercolor{section in head/foot}{bg=Brown}
 \setbeamercolor{author in head/foot}{bg=Brown}
 \setbeamercolor{date in head/foot}{fg=Brown}

 \begin{document}

 \section{Font to be changed in the headline}
 \begin{frame}
 \frametitle{A test frame}
 \end{frame}

 \end{document}

編輯：回答後，以下內容似乎對我不起作用

 \documentclass[xcolor=dvipsnames]{beamer}
 \mode<presentation>
 {
 \usetheme{AnnArbor}
 \setbeamercovered{transparent}
\useinnertheme{rounded}
   \usecolortheme{spruce}
 }

  \setbeamercolor{section in head/foot}{fg=White}


 \begin{document}

 \section{Font to be changed in the headline}
 \begin{frame}
 \frametitle{A test frame}
 \end{frame}

 \end{document}

我想保持主題不變，我只想將標題的字體更改為白色，否則無法閱讀。

謝謝。

Answer 1

fg為適當的顏色模板添加（前景）規格；例如：

 \setbeamercolor{section in head/foot}{bg=Brown,fg=red}
 \setbeamercolor{subsection in head/foot}{bg=gray!30,fg=black}

一個完整的例子：

\documentclass[xcolor=dvipsnames]{beamer}
\usetheme{CambridgeUS}
\useinnertheme{rectangles}
\useoutertheme{infolines}

\setbeamercolor{frametitle}{fg=Brown,bg=Brown!20}
\setbeamercolor{section in head/foot}{bg=Brown,fg=red}
\setbeamercolor{subsection in head/foot}{bg=gray!30,fg=black}
\setbeamercolor{author in head/foot}{bg=Brown}
\setbeamercolor{date in head/foot}{fg=Brown}

\begin{document}

\section{Font changed in the headline}
\begin{frame}
\frametitle{A test frame}
\end{frame}
\subsection{Font changed in the headline}
\begin{frame}
\frametitle{A test frame}
\end{frame}

\section{Font changed in the headline}
\begin{frame}
\frametitle{A test frame}
\end{frame}
\subsection{Font changed in the headline}
\begin{frame}
\frametitle{A test frame}
\end{frame}
 
\end{document}

由此產生的標題：

更新

編輯問題後，這

\documentclass[xcolor=dvipsnames]{beamer}
 \mode<presentation>
 {
 \usetheme{AnnArbor}
 \setbeamercovered{transparent}
\useinnertheme{rounded}
   \usecolortheme{spruce}
 }

  \setbeamercolor{section in head/foot}{fg=White}


 \begin{document}

 \section{Font to be changed in the headline}
 \begin{frame}
 \frametitle{A test frame}
 \end{frame}

 \end{document}

產生