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I want to print a map I made with qgis. For the print I need CMYK-colors but the print-composers pdf-output is RGB. How can I convert the RGB-map/-pdf to CMYK?

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Normally, the printer should handle the conversion. Do you need specific colours to display a certain way? Have you checked out You can convert RGB to CMYK fairly easily. – Fezter Mar 11 '13 at 3:52
Have you tried to export from qgis as bitmap and import into scribsu dtp (with colormangement enabled settings!) and export from scribus as pdf/x3 ? – Kurt Mar 22 '13 at 9:57
addendum and correction to my above comment: for workflow with scribus look here: – Kurt Mar 23 '13 at 7:21
up vote 1 down vote accepted

I highly recommend ghostscript - it's available for free both on Linux and Windows. See for the solution.

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