I am working on typesetting a book that has recently entered the public domain. It contains several pictures, all of which are in black and white. I have obtained all of them in B&W except two, which I have found in color.
I would like, if possible, using Pdflatex, to insert these two colorized images but have LaTeX display them in the PDF in black and white.
Consider the following code:
\documentclass{article}
\usepackage{graphicx}
\begin{document}
\includegraphics[width=7cm]{example-grid-100x100pt}
\end{document}
which outputs the colorized image:
QUESTION: How may the code in the MWE be modified in order to display the grid in shades of black and white?
Thank you.
