Converting PDFs to Greyscale

Needed to remove the colour from PDFs that were too big to print our our crappy printer.

find . -iname '*.pdf' -exec sh -c 'gs  -sOutputFile=grey/{} -sDEVICE=pdfwrite  -sColorConversionStrategy=Gray  -dProcessColorModel=/DeviceGray  -dCompatibilityLevel=1.4  -dNOPAUSE  -dBATCH {}' \;

Greyscale will print much better, although the colour versions look amazing.