Cette ligne crée un nouveau document dont le nom suffixé de “-grayscale” input=mycolordoc.pdf output=$(echo "$input" | sed 's/.pdf$/-grayscale.pdf/') gs -sDEVICE=pdfwrite -sColorConversionStrategy=Gray -dProcessColorModel=/DeviceGray -dCompatibilityLevel=1.4 -dNOPAUSE -dBATCH -sOutputFile="${output}" "${input}"

https://superuser.com/questions/104656/convert-a-pdf-to-greyscale-on-the-command-line-in-floss