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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?
1The profiles are the trick. Converting between color systems isn't exact. This is something that the printer should be handling so they can get the best conversion results out of their equipment. – afrazier – 2011-12-31T17:48:41.447
@afrazier Yes I know but I trying to explain the publisher that converting it without the right profile didn't bring anything. – Matteo – 2011-12-31T17:52:28.703
@RedGrittyBrick Any suggestion on a more or less standard profile that will allow me to submit the pictures avoiding to make a mess? – Matteo – 2011-12-31T17:53:37.360
1@RedGrittyBrick Just to be sure: the image has an sRGB profile. If I do
convert rgb.tiff -colorspace cmyk cmyk.tiff
will it work (keeping the same profile)? Am I doing something wrong? – Matteo – 2011-12-31T18:08:24.870@Matteo: Use ImageMagick's
identify -verbose rgb.tiff | egrep "Colorspace|Profile-"
to check the color profile of the file (if any). As I understand it, the profile you specify also determines the colorspace of the output file, you can't produce a CMYK image using an RGB color profile. If your printer can give you a sample image, you can extract a color profile from it. The documentation I linked to gives examples. Whether this will produce the results you seek I do not know. – RedGrittyBrick – 2012-01-01T11:51:39.153