¿Diferentes partes del pie de página en diferentes colores en Beamer?

Question

Me gustaría modificar las tres partes del pie de página en diferentes colores. ¿Como es posible? Aquí hay tres partes para mi pie de página.

\documentclass[10pt,xcolor={dvipsnames}]{beamer}
\usefonttheme{professionalfonts}
\useoutertheme{infolines}

\mode<presentation> {

\usetheme{Frankfurt}
\usecolortheme{whale}


\setbeamercolor{section in head/foot}{bg=blue!0!black,fg=white}
% -------------------------------------------------------------------------------------------------------------------------------------
% footer
%\setbeamercolor{section in foot}{fg=white, bg=OliveGreen}
%\setbeamercolor{section in foot}{fg=white, bg=MidnightBlue}
\setbeamerfont{footline}{size=\fontsize{6}{6}\selectfont}
%\setbeamercolor{section in foot}{fg=white, bg=ForestGreen}
%\setbeamercolor{section in foot}{bg=blue!40!black,fg=white}
\setbeamercolor{section in foot}{fg=white, bg=BlueViolet}
\setbeamertemplate{footline}
{
 \hbox{%
  \begin{beamercolorbox}[wd=.25\paperwidth,ht=2.6ex,dp=1ex,center]{section in foot}%
    \usebeamerfont{section in foot}\insertshortauthor
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.4\paperwidth,ht=2.6ex,dp=1ex,center]{section in foot}%
    \usebeamerfont{section in foot}\insertsubtitle
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.35\paperwidth,ht=2.6ex,dp=1ex,center]{section in foot}%
    \usebeamerfont{section in foot} Stanford \text{    } \insertframenumber/\inserttotalframenumber
  \end{beamercolorbox}}% 

  \vskip0pt%
}

\setbeamertemplate{navigation symbols}{}
}


\subtitle{\hspace{20mm} Signal Processing}
\author{Stephen}
\date{March 3, 2017}
% ------------------------------------------------------------------------------------------------------------------------------------------
\usepackage{graphicx} % Allows including images
\usepackage{booktabs} % Allows the use of \toprule, \midrule and \bottomrule in tables


\begin{document}

\begin{frame}[plain]
\titlepage % Print the title page as the first slide
\end{frame}

\begin{frame}
\frametitle{Overview} % Table of contents slide, comment this block out to remove it
\tableofcontents % Throughout your presentation, if you choose to use \section{} and \subsection{} commands, these will automatically be printed on this slide as an overview of your presentation
\end{frame}



%------------------------------------------------

\begin{frame}
\Huge{\centerline{The End}}
\end{frame}

%----------------------------------------------------------------------------------------

\end{document}

Answer 1

\documentclass[10pt,xcolor={dvipsnames}]{beamer}
\usefonttheme{professionalfonts}
\useoutertheme{infolines}

\mode<presentation> {

\usetheme{Frankfurt}
\usecolortheme{whale}

\setbeamercolor{section in head/foot}{bg=blue!0!black,fg=white}

\setbeamerfont{footline}{size=\fontsize{6}{6}\selectfont}
\setbeamercolor{section in foot}{fg=white, bg=BlueViolet}
\setbeamercolor{subsection in foot}{fg=BlueViolet, bg=white}
\setbeamertemplate{footline}
{
 \hbox{%
  \begin{beamercolorbox}[wd=.25\paperwidth,ht=2.6ex,dp=1ex,center]{section in foot}%
    \usebeamerfont{section in foot}\insertshortauthor
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.4\paperwidth,ht=2.6ex,dp=1ex,center]{section in foot}%
    \usebeamerfont{section in foot}\insertsubtitle
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.35\paperwidth,ht=2.6ex,dp=1ex,center]{subsection in foot}%
    \usebeamerfont{section in foot} Stanford \text{    } \insertframenumber/\inserttotalframenumber
  \end{beamercolorbox}}%

  \vskip0pt%
}

\setbeamertemplate{navigation symbols}{}
}

\subtitle{\hspace{20mm} Signal Processing}
\author{Stephen}
\date{March 3, 2017}

\usepackage{graphicx}
\usepackage{booktabs}

\begin{document}

\begin{frame}[plain]
\titlepage
\end{frame}

\begin{frame}
\frametitle{Overview}
\tableofcontents
\end{frame}

\begin{frame}
\Huge{\centerline{The End}}
\end{frame}

\end{document}