How can I align the pictures properly inside table cells?

Question

Firstly, please check the answer's LaTeX code:

\documentclass[12pt]{article}
\usepackage{graphicx}
\usepackage{array}
\begin{document}
\begin{tabular}{|m|m|m|}
\hline
 & Size & Figure \\  
\hline
One & 1cm*1cm & \includegraphics[width=1cm, height=1cm]{owl.jpg} \\ 
\hline
 Two & 2cm*2cm & \includegraphics[width=2cm, height=2cm]{owl.jpg} \\ 
\hline   
\end{tabular}
\end{document}

What commands should I need to use so that the table cells get auto-adjusted with the given picture size?
And how to center align (vertically and horizontally) every table cell content including the pictures?

TIA

Answer 1

Probably this is what you're looking for:

\documentclass[12pt]{article}
\usepackage{graphicx}
\usepackage[export]{adjustbox}
\usepackage{cellspace}
\setlength\cellspacetoplimit{\tabcolsep}
\setlength\cellspacebottomlimit{\tabcolsep}
\begin{document}
\begin{tabular}{|Sc|Sc|Sc|}
\hline
 & Size & Figure \\  
\hline
One & 1cm*1cm & \includegraphics[width=1cm, height=1cm, valign=c]{example-image} \\ 
\hline
 Two & 2cm*2cm & \includegraphics[width=2cm, height=2cm, valign=c]{example-image} \\ 
\hline   
\end{tabular}
\end{document}

Answer 2

The m columns should have some length associated, so you should use some like m{2cm} or use another type of column.

The l, c and r columns adjust automatically to the content, so it is all you need. You can use also @{} before and after the column to avoid the default padding defined by \tabcolsep.

On the other hand, note that by default the image will be aligned at bottom with "cm" of the left cell (is placed just as character), but you can center with the help of adjustbox package as showed in the MWE, and then will fit perfectly the biggest image.

\documentclass[12pt]{article}
\usepackage{graphicx}
\usepackage[export]{adjustbox}
\usepackage{array}
\begin{document}
\tabcolsep10pt
\begin{tabular}{|l|c|@{}c@{}|}\hline
 & Size & Figure \\\hline
One & 1cm*1cm & \includegraphics[valign=c,width=1cm]{example-image-1x1.jpg} \\\hline
 Two & 2cm*2cm & \includegraphics[valign=c,width=2cm]{example-image-1x1.jpg} \\\hline   
\end{tabular}
\end{document}

If you want some padding around the image, a trick without additional package is put the image in a \fbox{} but previously set \fboxrule to 0pt and \fboxsep to more that 0pt, obviously. (e.g. \fboxrule0pt\fboxsep1em\fbox{}. That allow even different paddings in the same column. For instance:

\documentclass[12pt]{article}
\usepackage{graphicx}
\usepackage[export]{adjustbox}
\usepackage{array}
\begin{document}
\tabcolsep10pt\fboxrule0pt\fboxsep\tabcolsep
\begin{tabular}{|l|c|@{}c@{}|}\hline
 & Size & Figure \\\hline
 One & 1cm*1cm & \fbox{\includegraphics[valign=c,width=1cm]{example-image-1x1.jpg}} \\\hline
 Two & 2cm*2cm & \fboxsep2pt\fbox{\includegraphics[valign=c,width=2cm]{example-image-1x1.jpg}} \\\hline
\end{tabular}
\end{document}