CMYK conversion from RGB

I have several RGB images that I have to convert to CMYK for a paper submission. I have a Photoshop Elements 9 license but it doesn't support CMYK.

I remember having tried with ImageMagick on Linux but never managed to generate a result with the same colors. Last time I sent the files to a friend with a Photoshop license to convert.

Is there a free or cheap tool on Mac OS X, Linux or Windows that will allow me to do the job?

Solution 1:

It seems you can use ImageMagick to convert from RGB to CMYK if you use the appropriate color profiles

For example if the source image contains a color profile

convert rgb_image.jpg -profile USCoat.icm cmyk_image.jpg

otherwise

convert rgb_image.jpg +profile icm \
                      -profile sRGB.icc  -profile USCoat.icm cmyk_image.jpg

But you must use appropriate color profiles, sRGB and USCoat are just examples.