Why is it that coloring in soul in beamer is not visible

Question

\documentclass{beamer} 
\usepackage{soul,color} 
\begin{document} 
\begin{frame} 
\hl{Hello World} 
\end{frame} 
\end{document}

I process this with pdflatex and I do not see the expected highlight. If I try to assign a color to overstrike same thing happens, as in

\setstcolor{red}
\st{Hello}

but \st{hello} by itself does overstrike hello in black when no color is set. Why is that and what is a work-around? Many That I tried do not work with long text.

The Soul Package Documentation, footnote 5, says something about needing a Postscript driver.

I do not have a problem using soul package outside of beamer.

Answer 1

beamer redefines nearly everything ... So we have to redefine \set@color and reset@color to its original definition before using \hl:

\documentclass{beamer}
\usepackage{soul}
\makeatletter
\let\HL\hl
\renewcommand\hl{%
  \let\set@color\beamerorig@set@color
  \let\reset@color\beamerorig@reset@color
  \HL}
\makeatother
\begin{document}
\begin{frame}   
Hello World
    
\hl{Hello World} 
\end{frame}
\end{document}