For example, I've been trying to force the image resolution to a very low value, but it doesn't seem to be working (i.e., a very pixeled 10 dpi or less). Setting
\pdfpxdimen, but it doesn't seem to make any difference. 
Code: Select all
\documentclass[12pt]{article}
\usepackage{graphicx}
\begin{document}
% tried this
%\pdfpxdimen=10in % 1 DPI
%\divide\pdfpxdimen by 3 % 0 % 96 DPI
\pdfpxdimen=\dimexpr 1in/3\relax
\includegraphics[height=1.4in]{matrix_operation}
\end{document}
