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I'm using the colortbl package to color table cells. I've combined this w/ the xcolor package to define my own colors. However, it appears that xcolor does not support transparency. I saw the package transparent, but it is oriented toward text and I wasn't able to set the transparency level of a defined color. Are there any packages that support alpha color channels?

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You could do that either with PSTricks or with PGF/TikZ. A similar problem was discussed here: latex-community.org/forum/viewtopic.php?f=5&t=697 – Mica Oct 28 '09 at 23:48
Yes, I saw that page, it doesn't really seem to address my question. Does anyone know how I could use TikZ to do this? I'd like to stick w/ pdflatex. – Peter Oct 29 '09 at 3:46
Thanks, I saw that one as well, but he does not actually color cells in that table using TikZ as far as I can see. He uses colortbl which to the best of my knowledge doesn't accept colors w/ alpha channels – Peter Oct 29 '09 at 18:12
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colortbl doesn't really care (much) what the color command is it just arranges to put a normal TeX rule behind the table cell and inser a "colour command" at suitable points to affect the color. so basically if tikz or pstricks or anything allows you to define a transparent colour such that (say) \color{something}\hrule makes a rule of transparent colour something then the same shoud work in colortbl. – David Carlisle May 18 '12 at 18:58
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migrated from stackoverflow.com May 18 '12 at 18:39

1 Answer

up vote 5 down vote accepted

The following shows colortbl transparent panels allowing the coloured box behind the table to show through.

enter image description here

\documentclass{article}

\usepackage{transparent,colortbl}


\makeatletter
\def\CT@@do@color{%
  \global\let\CT@do@color\relax
        \@tempdima\wd\z@
        \advance\@tempdima\@tempdimb
        \advance\@tempdima\@tempdimc
        \kern-\@tempdimb
\transparent{0.6}%
        \leaders\vrule
                \hskip\@tempdima\@plus  1fill
        \kern-\@tempdimc
        \hskip-\wd\z@ \@plus -1fill }
\makeatother

\begin{document}






\noindent\colorbox[rgb]{1,.5,.5}{\Large\strut \hspace{2in}}\hspace{-.5in}
\begin{tabular}{lll}
\rowcolor{blue} a & b & c\\
                aa&bb&cc\\
\rowcolor{yellow}1&2&3\\
                11&22&33
\end{tabular}
\end{document}
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this workaround doesn't work with tabularx – Frud Jan 21 at 14:06

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