Vertically center cells of a table?

Question

What is the easiest way to center align each row of table? I have a table column that contains an image and other cells in the same row contain text. I would like to know how to vertically center align the image and text cells. Currently each row is vertically bottom aligned. Here is my code:

\documentclass[a4paper]{article}
\usepackage[margin=1.0in]{geometry}
\usepackage{booktabs, caption, underscore, url, graphicx}
\captionsetup{font=bf}
\date{2012-03-01}
\begin{document}
\begin{table}[ht]
\centering

\begin{tabular}{cccc} \bottomrule[2pt]
A & B & V & D & E \\ \bottomrule
\includegraphics[scale=0.35]{img1.eps} & 2 & 3 & 4 \\ 
\includegraphics[scale=0.35]{img2.eps} & 2 & 3 & 4  \\ 
\bottomrule[2pt]
\end{tabular}

\end{table}
\end{document}

Here is a quick sketch of the table I am trying to achieve:

The first column contains an image while the other columns contain a single line of text. How can the text be center aligned with the middle of the image?

Answer 1

Vertically centering cell entries is possible via the m{<width>} column type from the array package. Horizontal centering is obtained by prepending the column entries with \centering\arraybackslash (also supported by array). For completeness and brevity, the MWE below defines the new column type M which does all of the above:

\documentclass[a4paper]{article}
%\usepackage{showframe}% http://ctan.org/pkg/showframe
\usepackage[margin=1.0in]{geometry}% http://ctan.org/pkg/margin
\usepackage{booktabs}% http://ctan.org/pkg/booktabs
\usepackage{array}% http://ctan.org/pkg/array
\newcolumntype{M}{>{\centering\arraybackslash}m{\dimexpr.25\linewidth-2\tabcolsep}}
\begin{document}
\begin{table}[ht]
  \centering
  \begin{tabular}{MMMM}
    \toprule
    A & B & D & E \\
    \midrule
    \rule{15pt}{10pt} & One & Two & Three \\ 
    \rule{15pt}{10pt} & Three & One & Two \\ 
    \rule{15pt}{10pt} & Two & Three & One \\ 
    \bottomrule
  \end{tabular}
\end{table}
\end{document}​

For images, I've used \rule{15pt}{10pt}, although the above solution works for any image size.

The table width is also chosen to fit exactly within the text block, making each of the four columns the same width (.25\linewidth-2\tabcolsep). To see this, uncomment the showframe package which highlights the text block boundary.

Answer 2

Images are always set with their base on the baseline (if they aren't rotated). So what you need is to lower the graphics; the easiest way is to say

\raisebox{-.5\height}{\includegraphics[scale=0.35]{img1.eps}}

If the height of the row is to be taken into consideration, then a slightly more complex calculation is necessary:

\raisebox{\dimexpr-.5\height+.5\ht\strutbox\relax}
  {\includegraphics[scale=0.35]{img1.eps}}

The adjustbox package has many features that ease this kind of job; after \usepackage{adjustbox} you can say

\adjustbox{valign=m}{\includegraphics[scale=0.35]{img1.eps}}