Vertical and horizontal cell centering in LaTex table - latex

Question

I am making a LaTex table and have trouble centering text (and images) inside cells themselves. The table as a whole is centered on the page, but what I want is that text and images in every cell are centered both vertically and horizontally.
This is my code
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{multirow}
\usepackage[table,xcdraw]{xcolor}
\usepackage{tabularray}
\usepackage{float}
\usepackage{graphicx}
\begin{document}
\begin{table}[H]
\centering
\begin{tabular}{|c|c|c|c|}
\hline
\rowcolor[HTML]{C0C0C0}
\textbf{Particle} & \textbf{Orientation} & \textbf{Symbol} & \textbf{Letter} \\[4ex] \hline
& in & {\includegraphics[scale=0.8]{im/inel.jpg}} & $u$ \\[2ex] \cline{2-4}
\multirow{-2}{*}{fermion} & out & {\includegraphics[scale=0.8]{im/outel.jpg}} & $\overline{u}$ \\[2ex] \hline
& in & {\includegraphics[scale=0.8]{im/inpoz.jpg}} & $\overline{v}$ \\[2ex] \cline{2-4}
\multirow{-2}{*}{antifermion} & out & {\includegraphics[scale=0.8]{im/outpoz.jpg}} & $v$ \\[2ex] \hline
& in & {\includegraphics[scale=0.8]{im/inph.jpg}} & $\epsilon_\mu$ \\[2ex] \cline{2-4}
\multirow{-2}{*}{foton} & out & {\includegraphics[scale=0.8]{im/outph.jpg}} & $\epsilon_{\mu}^*$ \\[2ex] \hline
\end{tabular}
\end{table}
\end{document}
This is what my code gives me (also notice how some lines are obscured by the images - that is not how I wanted it):
And, this is what I want:
Any help is welcome! Thank you

Answer 1

You are already loading the tabularray package, just use it instead of a tabular:
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{multirow}
\usepackage[table,xcdraw]{xcolor}
\usepackage{tabularray}
\usepackage{float}
\usepackage{graphicx}
\usepackage[export]{adjustbox}
\begin{document}
\begin{table}[H]
\centering
\begin{tblr}{
cells={valign=m,halign=c},
row{1}={bg=lightgray,font=\bfseries,rowsep=8pt},
colspec={QQQQ},
hlines,
vlines
}
Particle & Orientation & Symbol & Letter\\
\SetCell[r=2]{} fermion& in & \includegraphics[scale=0.5,valign=c]{example-image-duck} & $u$ \\
& out & \includegraphics[scale=0.5,valign=c]{example-image-duck}& $\overline{u}$ \\
\SetCell[r=2]{} antifermion & in & \includegraphics[scale=0.5,valign=c]{example-image-duck} & $\overline{v}$ \\
& out & \includegraphics[scale=0.5,valign=c]{example-image-duck} & $v$ \\
\SetCell[r=2]{} photon & in & \includegraphics[scale=0.5,valign=c]{example-image-duck} & $\epsilon_\mu$ \\
& out & \includegraphics[scale=0.5,valign=c]{example-image-duck} & $\epsilon_{\mu}^*$ \\
\end{tblr}
\end{table}
\end{document}