Save PDF with CMYK color encoding

Most printing services require CMYK color encoding, which is not natively supported by Inkscape. Because of that, you will need some third-party solution.

Firstly, I have tried Inkscpae extension, ExportPDFCMYK, but unfortunately it turned out not working in my setting (Ubuntu 14.04).

But then, I have came across ghostscript-based solution, that works great! Simply export your project into PDF in Inkscape and then execute:
[bash]
f=poster.pdf
gs -dSAFER -dBATCH -dNOPAUSE -dNOCACHE -sDEVICE=pdfwrite \
-sColorConversionStrategy=CMYK -dProcessColorModel=/DeviceCMYK \
-sOutputFile=${f%????}_cmyk.pdf $f
[/bash]

Inspired by zeroset.

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