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, this Stackoverflow post Archive worked for me:

-sColorConversionStrategy=CMYK -dProcessColorModel=/DeviceCMYK \
-sOutputFile=output.pdf input.pdf
Henning Koch almost 11 years ago
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