Hi, I followed the instructions as in http://wiki.inkscape.org/wiki/index.php/ExportPDFCMYK but I receive this error

Traceback (most recent call last):
File "export-pdf-cmyk.py", line 268, in <module>
effect.affect()
File "/usr/share/inkscape/extensions/inkex.py", line 215, in affect
self.effect()
File "export-pdf-cmyk.py", line 243, in effect
prepare_svg_to_pdf()
File "export-pdf-cmyk.py", line 216, in prepare_svg_to_pdf
areas_de_bitmaps = what_export()
File "export-pdf-cmyk.py", line 78, in what_export
export_area.append(child.attrib['id'])
File "lxml.etree.pyx", line 2198, in lxml.etree._Attrib.__getitem__ (src/lxml/lxml.etree.c:49115)
KeyError: 'id'

What should I do?

I get the same here, using PClinuxOS 32 bit & 0.48.4 That error message and it generates a zero length PDF file.

The alternative cmyk-tiff is a bit better. Still a couple of error messages and best to lose any transparency but it does work.

Then of course you have to package that as a PDF, Do not use it, but I understand Scribus is a good way to go.

AFAIK Jonata the author, switched development to an enhanced version Output-Pro, again only linux and seems to have stalled, The interface is in Portuguese, but I did try and translate it one time. Only exports to cmyk jpeg.

screenshot http://i.imgur.com/Uzb8qc5.jpg

Maybe something here will be helpful? viewtopic.php?f=11&t=5943