Took measurement data and built two RGB profiles identically except for the version (V2 vs. V4) in i1Profiler. Converted one image using both (Perceptual), compared the differences in ColorThink Pro. There IS a difference but not a lot! -------------------------------------------------- dE Report Number of Samples: 78900 Delta-E Formula dE2000 Overall - (78900 colors) -------------------------------------------------- Average dE: 1.09 Max dE: 2.22 Min dE: 0.00 StdDev dE: 0.32 Best 90% - (71009 colors) -------------------------------------------------- Average dE: 1.04 Max dE: 1.46 Min dE: 0.00 StdDev dE: 0.29 Worst 10% - (7891 colors) -------------------------------------------------- Average dE: 1.55 Max dE: 2.22 Min dE: 1.46 StdDev dE: 0.09 -------------------------------------------------- -------------------------------------------------- Andrew Rodney http://www.digitaldog.net/