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Unfortunately, the GIMP provides very little support for working in CMYK. There is the Decompose function, found in the Image:Image/Mode menu, which offers a CMYK option in its dialog. This is not terribly useful, though. To make the GIMP truly pre-press capable, the following is needed:
* The ability to set K in the range 0 to .
* The ability to convert RGB to CMYK while applying color gamut limitations.
* The ability to work in CMYK space just like in RGB space. This means a Channels dialog with C, M, Y, and K components and color editing functions and tools like Curves, Levels, Color Picker, and so on, which work in CMYK.
There is also the perception that spot colors are needed to make an effective pre-press image manipulation tool. Although there is much pageantry about the colorimetry, device calibration, and Pantone ink systems available for Adobe's Photoshop, these are somewhat of a red herring. Making these systems work is difficult and unreliable. Physical printing devices like presses tend to produce different results from day to day and even from run to run. In the printing process, there are many problems that can change the color balance so carefully calibrated on the monitor. The amounts of ink the printer uses, the capability of the press to apply the specified percentages of ink uniformly across the printing surface, and many other environmental and press health factors make for significant variability in the final result. No amount of calibration and proprietary ink systems can fix that.
Thus, the main hurdle to cross before the GIMP can become a viable pre-press tool is the functionality given in the preceding bulleted list.