Here is the current method for getting CMYK into a PDF when starting in Inkscape: http://libregraphicsworld.org/blog/entry/getting-cmyk-colors-from-inkscape-to-scribus

Yes, it requires another tool to achieve it, but that's where things stand. The renderer we use to produce PDF does not have support for color spaces other than RGB and adding it isn't trivial.

Cheers,
Josh

On Wed, Mar 2, 2016 at 8:57 AM, Jon A. Cruz <jon@...204...> wrote:
A quick summary is that while Inkscape proper supports correct
ICC-linked CMYK color, the library we use to draw to PDF output is
limited to RGB only. We either need to get that changed to support ICC
colors properly or switch to some library that does.

Note that this is not just "CMYK" but requires work in fully correcting,
ICC-aware color manipulations.

On Wed, Mar 2, 2016, at 06:40 AM, Bernhard Kleine wrote:
> I am sorry when I have raised the issue of CMYK vs. RGB in the wrong
> thread, but since I am targeted by the issue anew, I would like to know
> where do we stand and whether it is possible and how to drill the PDF
> with correct color codes?
>
> Thanks for any answer!
> Bernhard
>
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--
  Jon A. Cruz
  jon@...204...

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