Roger, you can get information about the origin (or dataset) used to create the standard ICC profiles Adobe is using by simply downloading the ICC Profile archive on Adobe’s web site. It contains a Read Me PDF with all the information related to those profile... except the dataset.
About the "U.S. Sheetfed Coated v2" you ask for, here is the reference:
U.S. Sheetfed Coated v2 Characterization used: 3M/Imation Matchprint using commercial substrate URL for characterization: none Black start: L* = 65, C = 35% Max. K: 85% Max. total Ink: 350% Paper White: L = 97.19, a = -0.61, b = 1.81 Gray Balance at 25%: C = 25, M = 19, Y = 19 Gray Balance at 50%: C = 50, M = 39, Y = 39 Gray Balance at 75%: C = 75, M = 63, Y = 62
U.S. Sheetfed Uncoated v2 Characterization used: GRACoL test sheet URL for characterization: none Black start: L* = 67, C = 38% Max. K: 95% Max. total Ink: 260% Paper White: L = 91.25, a = 0.48, b = -2.3 Gray Balance at 25%: C = 25, M = 18, Y = 17 Gray Balance at 50%: C = 50, M = 39, Y = 39 Gray Balance at 75%: C = 75, M = 62, Y = 63
As you can see, Sheeffed Coated if made from a Matchprint, and Uncoated is made from a different dataset (Gracol test sheet). Two profiles, made from two completely different datasets, but has only the "paper" as the difference. Wow!
About the ones who would like changing the black generation, the only way to go is to recalculate the ICC profile. If you attempt to modify the relationship between Black and its complement CMY, you are breaking up the puzzle.
Louis Dery v.p. Nouvelles Technologies / New Technologies TGLC inc. www.tglc.com email@hidden 418-877-9114
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