pdf2cmyk

#!/usr/bin/sh

# https://bugs.launchpad.net/inkscape/+bug/574717
# http://zeroset.mnim.org/2014/07/14/save-a-pdf-to-cmyk-with-inkscape/
# https://stackoverflow.com/questions/6241282/converting-pdf-to-cmyk-with-identify-recognizing-cmyk

# Warning: -dSAFER causes errors on my system.

ICC=${2:-/usr/share/color/icc/ISOcoated_v2_eci.icc}

# Low resolution images:
#    -dPDFSETTINGS=/prepress \

# Much larger file sizes:
#    -dEncodeColorImages=false \
#    -dEncodeGrayImages=false \
#    -dEncodeMonoImages=false \

# Slow or blocked:
#    -dHaveTransparency=false \

gs -o ${1%%.pdf}_cmyk.pdf \
    -dBATCH -dNOPAUSE -dNOCACHE \
    -sDEVICE=pdfwrite \
    -sColorConversionStrategy=CMYK \
    -dProcessColorModel=/DeviceCMYK \
    -sDefaultCMYKProfile=$ICC \
    -sOutputICCProfile=$ICC \
    $1

#gs -o ${1%%.pdf}_cmyk.pdf \
#    -dPDFX \
#    -dBATCH \
#    -dNOPAUSE \
#    -dNOOUTERSAVE \
#    -dPDFSETTINGS=/prepress \
#    -dEncodeColorImages=false \
#    -dEncodeGrayImages=false \
#    -dEncodeMonoImages=false \
#    -dCompatibilityLevel=1.4 \
#    -dRenderIntent=3 \
#    -sDEVICE=pdfwrite \
#    -sColorConversionStrategy=CMYK \
#    -sProcessColorModel=DeviceCMYK \
#    -sDefaultCMYKProfile=$ICC \
#    -sOutputICCProfile=$ICC \
#    -sColorConversionStrategy=CMYK \
#    -sColorConversionStrategyForImages=CMYK \
#    $1

#gs -o ${1%%.pdf}_cmyk.pdf \
#    -dNOPAUSE -dBATCH -dSAFER \
#    -sDEVICE=pdfwrite \
#    -dPDFSETTINGS=/prepress \
#    -dEncodeColorImages=false \
#    -dEncodeGrayImages=false \
#    -dEncodeMonoImages=false \
#    -dOverrideICC=true \
#    -dHaveTransparency=false \
#    -dCompatibilityLevel=1.4 \
#    -dRenderIntent=3 \
#    -dDeviceGrayToK=true \
#    -sDefaultCMYKProfile=/usr/share/color/icc/ISOcoated_v2_eci.icc \
#    -sOutputICCProfile=/usr/share/color/icc/ISOcoated_v2_eci.icc \
#    -sProcessColorModel=DeviceCMYK \
#    -sColorConversionStrategy=CMYK \
#    -sColorConversionStrategyForImages=CMYK \
#    $1

#gs -o ${1%%.pdf}_cmyk.pdf \
#    -dSAFER -dBATCH \
#    -dNOPAUSE -dNOCACHE -sDEVICE=pdfwrite \
#    -sColorConversionStrategy=CMYK \
#    -dProcessColorModel=/DeviceCMYK \
#    $1

#gs -o ${1%%.pdf}_cmyk.pdf \
#    -dPDFX \
#    -dBATCH \
#    -dNOPAUSE \
#    -dNOOUTERSAVE \
#    -dPDFSETTINGS=/prepress \
#    -dCompatibilityLevel=1.5 \
#    -sDEVICE=pdfwrite \
#    -sColorConversionStrategy=CMYK \
#    -sProcessColorModel=DeviceCMYK \
#    -dHaveTransparency=false \
#    PDFX_def.ps \
#    $1