Convert PDF files to black and white

With ghostscript and ps2pdf.

http://jon.dehdari.org/tutorials/pdf_tricks.html

gs -dNOPAUSE -dBATCH -q -sOutputFile=- -sDEVICE=psmono input.pdf | ps2pdf – output.pdf

I haven’t tried. It’s interesting to reduce size of large PDF files.

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