Color table rows and columns

Question

I have a table whose rows are set to alternate between white and gray using xcolor's \rowcolors{2}{white}{gray!10}. I also want to highlight a column of that table, sos that it looks something like this:

I tried using \begin{tabular}{c>{\columncolor{_lblue!25}}cc} to do this, but that just overwrites the color, blending it with white. Is there a way to blend the row and column colors so that it looks like the image? Maybe a variable that holds the background color so I can do something like \columncolor{_lblue!25!\cellbgcolor}?

Edit: What I have right now is

\rowcolors{2}{white}{gray!10}
\begin{tabular}[c>{\columncolor{blue}}cc]
    a & b & c \\
    \hline
    1 & 2 & 3 \\
    4 & 5 & 6 \\
    7 & 8 & 9
\end{tabular}

I've tried to use the transparency package to see I might be able to make the column color transparent in case it was overlaid instead of overwriting, but that makes the whole cell including text transparent. I don't know how I might go about alternating the color on each row while keeping track of the column color.

Answer 1

unfortunately coloring of rows and columns in table doesn't has option for transparency of row colors (as far as i know). so it should be imitated by \cellcolor with appropriate color. for example like this:

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[table]{xcolor}
\newcommand\ccg[1]{\cellcolor{gray!30!red!30}{#1}} % for cells in second column 
                                                   % and gray colored rows
\newcommand\ccw[1]{\cellcolor{red!15}{#1}}         % for cells in  second column 
                                                   % white colored rows

\begin{document}
\rowcolors{1}{white}{gray!30}
    \begin{tabular}{c c c}
        a   & \ccw{b}   & c     \\
        \hline
        1   & \ccg{2}   & 3     \\
        4   & \ccw{5}   & 6     \\
        7   & \ccg{8}   & 9     \\
    \end{tabular}
\end{document}

Answer 2

One way that I have since figured out is to ditch \rowcolors completely. This lets you highlight rows and columns, shades alternating columns, and will blend colors for highlights. It might not be too pretty, but it works.

\documentclass[a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[table]{xcolor}
\usepackage{etoolbox}
\usepackage{array}

\begin{document}
    \def\graybg{black!20!white}%
    \def\currowcolor{\graybg}%
    \newcolumntype{H}[1]{>{\cellcolor{\currowcolor!60!#1}}c} % Highlighted col
    \newcolumntype{C}{H{white}} % Normal col

    \newcommand{\rowalt}
            {%
            \ifdefstring{\oldcol}{NONE}%
                {%
                    \ifdefstring%
                        {\currowcolor}{\graybg}%
                        {\global\def\currowcolor{white}}%
                        {\global\def\currowcolor{\graybg}}%
                }%
                {%
                    \ifdefstring%
                        {\oldcol}{\graybg}%
                        {\global\def\currowcolor{white}}%
                        {\global\def\currowcolor{\graybg}}%
                    \global\def\oldcol{NONE}%
                }%
            }%

    % Overwrite the row color (while preserving shading and column colors)
    \newcommand{\owc}[1]%
        {%
            \global\let\oldcol\currowcolor%
            \global\def\currowcolor{\oldcol!50!#1}%
        }%

    \newenvironment{mytable}[1]
        {%
        \global\def\oldcol{NONE}%
        \def\currowcolor{\graybg}%
        \begin{tabular}{!\rowalt #1}%
        }%
        {%
        \end{tabular}%
        }%

    \begin{mytable}{CH{blue!50}CCC}
        a & b & c & d & e \\
        \hline
        1 & 2 & 3 & 2 & 1 \\
        4 & 5 & 6 & 5 & 4 \\
        \owc{red}7 & 8 & 9 & 8 & 7 \\
        \owc{red}4 & 5 & 6 & 5 & 4 \\
        1 & 2 & 3 & 2 & 1
    \end{mytable}
\end{document}

Answer 3

Here is a way to that with {NiceTabular} of nicematrix. The environment is similar to the classical {tabular} (of array) but adds PGF/Tikz nodes under the cells, rows and columns. It's possible to use those nodes to draw whatever you want before the construction of the main array (in the \CodeBefore).

\documentclass{article}
\usepackage{nicematrix,tikz}

\begin{document}
\begin{NiceTabular}{ccc}
\CodeBefore
  \begin{tikzpicture}
  \fill [gray!10] (2-|1) rectangle (3-|last) 
                  (4-|1) rectangle (5-|last) ;
  \fill [blue,fill opacity = 0.2] (1-|2) rectangle (last-|3) ;
  \end{tikzpicture}
\Body
    a   & b   & c     \\ \hline
    1   & 2   & 3     \\
    4   & 5   & 6     \\
    7   & 8   & 9     \\
\end{NiceTabular}
\end{document}

You need several compilations (because nicematrix uses PGF/Tikz nodes).