How to convert external graphics automatically to black&white

Question

For the last ten week me and 9 other students have worked on a report. And the final version of the report needs to be printed in black&white (so no color). The easiest method is use the grey setting of the printer. However, many picture in the report are now unclear. Therefore, I would like to ask you guys the following question: "Is there an option in latex which automatically prints the pdf in black&white?"

This is the following setup I use for latex

\documentclass[a4paper,11pt,oneside]{scrbook}
\usepackage{geometry}
  \geometry{a4paper}
    \geometry{width=0.7\paperwidth,height=0.8\paperheight}
\usepackage{graphicx}
\usepackage{rotating}             
\usepackage{epsfig}
\usepackage{amsmath}
\usepackage{epstopdf}
\usepackage{fullpage}
\usepackage{url} 
\usepackage[parfill]{parskip}
\usepackage{float}
\usepackage{pdfpages}
\usepackage{titlesec}                       
\usepackage{multirow}
\usepackage{eurosym}                            
\usepackage{gensymb}                            
\usepackage{appendix}                       
\usepackage{titlesec}
\usepackage{booktabs}                       
\bibliographystyle{unsrt} 

\usepackage[monochrome]{color} % if I use this I get an error: option clash for package color.
%%%%%%%%%%%

and if I put in behind the documentclass like

\documentclass[a4paper,11pt,monochrome]{scrbook} % it still prints the pdf in color.

I hope one of you guys can help with this.

Answer 1

I guess that one of the other packages loads color with options, but I don’t know which …

Note that it’s recommended to use the newer xcolor instead of pdfcolor

Update

pdfpages causes the error.

Update 2

Load (x)color before pdfpages:

\documentclass{scrbook}
\usepackage[monochrome]{xcolor}
\usepackage{pdfpages}

\begin{document}
Test \color{green} Green
\end{document}