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preface: as mentioned in @Gez answer, its likely you won't actually want to do some automated conversion from RGB to CMYK, however... there may be some situations where an automated conversion makes sense and can be tweaked to fit your needs - this answer may be useful to you.

preface: as mentioned in @Gez answer, its likely you won't actually want to do some automated conversion from RGB to CMYK, however... there may be some situations where an automated conversion makes sense and can be tweaked to fit your needs, in that case, this answer may be useful to you.

preface: as mentioned in @Gez answer, its likely you won't actually want to do some automated conversion from RGB to CMYK, however... there may be some situations where an automated conversion makes sense - this answer may be useful to you.

preface: as mentioned in @Gez answer, its likely you won't actually want to do some automated conversion from RGB to CMYK, however... there may be some situations where an automated conversion makes sense and can be tweaked to fit your needs - this answer may be useful to you.

No, this feature isn't supported by Blender, but using an add-on and image-magick, this can be done.

Imagemagick will need to be installed and the command convert will need to be in your path.

No, this feature isn't supported by Blender.

preface: as mentioned in @Gez answer, its likely you won't actually want to do some automated conversion from RGB to CMYK, however... there may be some situations where an automated conversion makes sense - this answer may be useful to you.

Using an add-on and ImageMagick, this can be automated.

ImageMagick will need to be installed and the command convert will need to be in your path.