Re: Colour managing/process controlling process colour tints
No it's not a great idea. If you want the countries to print the same, then see how close they print now. ISOcoatedv2 and GRACoL2006_Coated1v2 are very close anyways. In fact, if everyone knew how close they were, they probably would ask in large numbers for one unified/universal characterization data and ICC profile.
Note: TVI/Dot Gain obtained by getting Lab values, converting them to XYZ values, and then determining TVI/Dot gain from XYZ values. See Bruce Lindbloom's LabDotGainCalculator and Don Hutcheson's website for his Formulae, which both give the same TVI although using two different formulas for getting the intermediate XYZ values (I have made the calculators to prove it). The IDEAlink Curve software, Bruce Lindbloom, and Don Hutcheson all three use the same formula to get TVI numbers from XYZ. Also, my calculator I built using these formulas has been shown to be within 1% accuracy to PerfX Press Curves software by Louis Dery himself.
GRACoL2006_Coated1v2
K 50 TVI = 19.41, C 50 TVI = 12.95, M 50 TVI = 14.15, Y 50 TVI = 15.57
ISOcoatedv2
K 50 TVI = 16.90, C 50 TVI = 10.42, M 50 TVI = 14.15, Y 50 TVI = 13.67
Difference between the two
K 50 TVI diff = 2.51, C 50 TVI diff = 2.53, M 50 TVI diff = 0, Y 50 TVI diff = 1.91
So they share the same solids, the same paper brightness, and have really close TVI between the two. You can barely see a difference between the two when the same CMYK values are proofed/printed on the two different printing conditions and compared.
As I said before, if you tried to make 50 in file to measure 50 on paper, it would be WAY TOO LIGHT. Please conform to standards and most won't see a difference between the two anyways - even if printing the same CMYK values in the file on both and comparing side-by-side. Proof your CMYK numbers on a calibrated and profiled proofer to both ISOcoatedv2 and GRACoL2006_Coated1v2 (using standard profile as source and custom proofer profile as destination), compare, and see for yourself. Or soft-proof your CMYK numbers on a calibrated and profiled monitor using the standard profiles to proof in Photoshop (check keep numbers, also check simulate paper and ink), and compare to see really how close they are.
Then we can get past this and on to something else (like out-of-gamut colors being mapped into the gamut to get the best reproduction of those out-of-gamut colors, so we don't get purple or different blues when converting the same e.g. RGB Blue to CMYK).
Don