4.52 what are values of extensions for images

Using this:

\documentclass[11pt,notitlepage]{article}% 
\usepackage{graphicx} 
\begin{document} 
 
\makeatletter 
\Gin@extensions 
\makeatother 
 
\end{document}
 

Compiled with htlatex gives

.eps,.ps,.eps.gz,.ps.gz,.eps.Z,.mps
 

and compiled with pdflatex gives

.png,.pdf,.jpg,.mps,.jpeg,.jbig2,.jb2,.PNG,.PDF,.JPG,.JPEG,.JBIG2,.JB2,.eps
 

And compiled with lualatex gives

.png,.pdf,.jpg,.mps,.tif,.jpeg,.PNG,.PDF,.JPG,.JPEG,.eps