Possible Duplicate:
Can \includegraphics be used to change an image color?
Is it possible to include a color figure and export it in black and white, converting it at compile time?
Something like the following:
\includegraphics[blackandwhite]{myfigure.png} % Not working code!!
\includegraphics. I'm afraid you'll need to convert the images by hand with another tool, e.g, with ImagicMagick'sconvert.:(– Paulo Cereda Aug 17 '12 at 10:07