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How to convert RGB images to CMYK colorspace with GIMP or ImageMagick freeware tools using dedicated icc color profile for upload to online printing service like flyeralarm saxoprint

I dont have Adobe Photoshop and Publisher 2013 does not Export CMYK Images. I wanted to send an Image to be printed to an online printing service (flyeralarm). They required the image the to be a jpeg, tif or PDF with images in CMYK color space using the  „ISO Coated v2 300 % (ECI)“ color profile.

How-I-fixed-it:
I found a couple of ways, how to convert my RGB jpeg image to CMYK colorspace:

1. Using GIMP
Theres a plugin for the (great!) open source freeware GIMP (GNU Image Manipulation Program), which is called separate+ and can be found here. Download it and copy the required files to your GIMP Plug-Ins folder. You also need the ICC Color profiles, which can be downloaded from Adobe here. Copy the profiles to C:WindowsSystem32spooldriversColor
After that, GIMP color management allows you to select the desired Profile.
Theres a much more detailed description here (in German).

2. Using the "convert" tool of ImageMagick
Install ImageMagick on your computer.
You also need the ICC Color profiles, which can be downloaded from Adobe here. Copy the profiles to C:WindowsSystem32spooldriversColor

Using the command line type
convert sourcefile.jpg -profile Path_to_color_profile.icc outputfile.jpg
or, if you want a PDF:
convert sourcefile.jpg -profile Path_to_color_profile.icc outputfile.pdf

The detailed description can be found here (in German).

3. There are online Services that do the conversion for you:
http://www.rgb2cmyk.org/
http://www.cmykconverter.com/


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