Convert the colorspace of a PDF from RGB to CMYK under Ubuntu Linux
Note that converting from RGB to CMYK will usually degrade your colors because no exact mapping is possible. Anyway,worked for me:
gs -dSAFER -dBATCH -dNOPAUSE -dNOCACHE -sDEVICE=pdfwrite \ -sColorConversionStrategy=CMYK -dProcessColorModel=/DeviceCMYK \ -sOutputFile=output.pdf input.pdf
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