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GMG is indeed aware of the issue, but I should point out that this isn't limited to GMG and its usually not all that bad a match, all things considered. Any proof could have a similar issue predicting how spot channels react with process if there's no N-Color profile (created from a target of CMYK+Spots). After all, the only info you providing is usually just a solid Lab value that you want to match, usually not a gradation and almost never a number of patches mixing with CMYK. The software might be great at the solids, perhaps even the gradations, but you can't predict how overprints with spot channels will look without an N-Color profile
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