There is an excellent answer to a very similar question already. I tried to adapt it to my use case: 6 1/4" x 9" paper. But doing so added empty pages at the end of each chapter, before the illustrations. What am I doing wrong?
\documentclass[12pt,smallroyalvopaper]{memoir}
\usepackage{lipsum}
\usepackage{graphicx}
\usepackage[left=0.75in, right=0.875in, top=0.75in, bottom=0.75in]{geometry}
\usepackage{mwe}
\newcommand\chapimage[1]{%
\cleartoverso
\noindent\begin{picture}(0,0)%
\put(-55,-585){%
\includegraphics[width=0.95\stockwidth,height=0.95\stockheight]{#1}}%
\end{picture}
\clearpage}
\begin{document}
\chapimage{example-image-a}% don't use extension
\chapter{Title ch1}%
\lipsum[1-3]
\chapimage{example-image-b}
\chapter{Title ch2}%
\lipsum[2-4]
\chapimage{example-image-c}
\chapter{Title ch2}%
\lipsum[3-5]
\end{document}
Edit:
This is the output with \cleartorecto



\cleartoevenpageand it seemed to do the trick. – SuperAl Nov 16 '19 at 19:55