Only tangetially related, but is there any good way of working with color profiles and different color spaces at all in open-source software? I recently had to

Only tangetially related, but is there any good way of working with color profiles and different color spaces at all in open-source software? I recently had to prepare a PDF with playing cards for printing. I was supposed to ship a PDF in CMYK with ISO Coated v2 300% (ECI). Source images from which the PDF was generated were SVG, thus sRGB. I tried using ghostscript to convert to CMYK and apply the color profile. The conversion to CMYK apparently worked, however, they told me that there are some places that have more than 300 % color. I searched all weekend for something that could use the color profile, work in CMYK and maybe something else that could actually show me where colors went out of gamut. Somehow all that seems to only be possible using Adobe software, which makes it quite hard to supply printers with good input when restricting yourself to open-source software. Or maybe I missed a lot of things and didn't search hard enough; also possible.