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I am using \uwave{Some text here} to put a wave like emphasis under the text. Is it possible to change the color of only the wave and leave the text black?

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up vote 21 down vote accepted

It is highly recommended that you post a minimal example. It is possible to only color the wave part by redefining the command \uwave or by creating a new command named \redwave as you like.

\documentclass[11pt]{article} 
\usepackage{xcolor}
\usepackage{ulem}
\makeatletter
\def\uwave{\bgroup \markoverwith{\lower3.5\p@\hbox{\sixly \textcolor{red}{\char58}}}\ULon}
\font\sixly=lasy6 % does not re-load if already loaded, so no memory problem.
\makeatother
\begin{document}
  \uwave{This is a long test}
\end{document}

The ulem package uses the wiggle from the 6-pt lasy font and we just use textcolor to color it.

One could extend the above code to give it a more semantic name, as suggested by TH and also to give an optional color. The MWE below defines a command \colorwave for this purpose.

\documentclass[11pt]{article} 
\usepackage{xcolor}
\usepackage{ulem}
\usepackage{lipsum}
\makeatletter
\newcommand\colorwave[1][blue]{\bgroup \markoverwith{\lower3.5\p@\hbox{\sixly \textcolor{#1}{\char58}}}\ULon}
\font\sixly=lasy6 % does not re-load if already loaded, so no memory problem.
\makeatother
\begin{document}
 \colorwave[red]{This is a long test} \lipsum*[1].\par
 \colorwave[green]{This is a long test} \lipsum*[1]
\end{document}

enter image description here

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Nice. One could make a \colorwave based on this where the color to use is passed in as an argument. –  TH. Dec 18 '10 at 1:45
    
@TH Sure and it will be better rather than redefining the original command. –  Yiannis Lazarides Dec 18 '10 at 3:54
    
For thicker line consult this link. Or substitute: lasy6 -> lasyb10 scaled 652 –  user23191 Dec 11 '12 at 11:06
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