How to convert PDF to Grayscale
I found a solution in a blog post:
With GhostScript (and Windows users can access gs
via cygwin), you can do it with the following command:
gs \
-o grayscale.pdf \
-sDEVICE=pdfwrite \
-sColorConversionStrategy=Gray \
-dProcessColorModel=/DeviceGray \
-dCompatibilityLevel=1.4 \
source.pdf
This will convert source.pdf
to grayscale.pdf
and not put you into a GhostScript shell (due to the -o
option instead of the -sOutputFile=
option).
Sounds like a job for Imagemagick. Windows and Linux versions are available.
http://www.imagemagick.org/script/index.php
This should do the trick at the command line:
convert -colorspace GRAY original.pdf grayscale.pdf