Tools for generating the Volumetric Regimes book https://volumetricregimes.xyz/ (wiki-to-print, using Paged.js)
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#! /bin/bash
# CONVERTS RGB PDF TO CMYK PDF PRESERVING TRUE BLACK FOR VECTORS
# OVERPRINT FEATURE IS AVAILABLE WITH AN OPTION
# USAGE:
# ./rgb2cmyk.sh input.pdf
# ./rgb2cmyk.sh input.pdf overprint
# OUTPUT:
# input-cmyk.pdf
# input-cmyk-op.pdf (in case of overprint)
bn=$(basename $1 ".pdf")
op=${2:-knockout}
gs -q -sDEVICE=pdfwrite -o ${bn}-CMYK.pdf -sColorConversionStrategy=CMYK -sSourceObjectICC=control.txt $1
if [ $op == overprint ]
then
pdftops -level2sep ${bn}-CMYK.pdf
sed -e "s/false \(op\)/true \1/gI" ${bn}-CMYK.ps > ${bn}-CMYK-op.ps
#gs -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=${bn}-CMYK-op.pdf ./forceblack.ps ${bn}-CMYK-op.ps
gs -q -sDEVICE=pdfwrite -o ${bn}-CMYK-op.pdf -sColorConversionStrategy=CMYK -sSourceObjectICC=control.txt ${bn}-CMYK-op.ps
rm ${bn}-CMYK.pdf
rm ${bn}-CMYK.ps
fi