Hello Jan-Peter, > Can you please explain, how you judge the grey-balance of the profiled > printer ? > - Do you print print a Lab- or RGB-greyscale ? > - Do you have printed reference to match ? > - What is the paperwhite of your profiled paper ? > - What is the paperwhite of your reference (if you have one?) I print a Lab to CMYK L* scale with a* and b* values equal to zero. Regardless of the Intent, this method reveals any weaknesses in the predicted neutral scale. I do the conversion in Photoshop. If I convert Perceptually or RelCol, then I look for measured a* and b* values equal to the unprinted substrate. If I convert AbsCol then the a* and b* values must equal to zero. I don't use a printed reference to match. I use my instrument as the pass/fail criteria and calculate deviations in DeltaEab. Paper white is Fuji Fpsatin : 93 0 -4 to 94 0 -5 (depending what I use to measure it). I realize -4 to -5 in b* is rather high but I've seen worse. > I´m mainly doing profiling for Epson Ultrachrome in the field of digital > proofing. In this case, it is necessary to use a proofmedia, which has > more or less the same paperwhite as the printed reference, to get a > visual good greybalance. So you proof RelCol? > In the field of printing RGB-data, I prefer media with low amount of > optical brightners resulting to a paperwhite near a=0 an b=0 Right. Like Tecco papers. I tested them once but I can't source them locally :( > If you wan´t to print RGB-data on photographic paper with medium or a > big amount of optical brighteners, there is no other way as to tweak the > profile manually. Richtig. > Sometimes the compensation of optical brightners in Profilemaker or > PrintOpen helps. Sometimes. > If you have measurement Equipment with UV-cut, this also can help. I tried with DTP41uv and 530 + UV-cut filter and still no magic. > But > beware, that for proofing both source- and target-profile should be > measured with UV-cut. Are you sure? If the Source paper has *no* FWA then, in principle, measuring with or without a UV-cut filter should have no effect. But the proofing paper often will exhibit FWA. > :-) Jan-Peter Regards, Roger Breton | Laval, Canada | graxx@xxxxxxxxxxxx http://pages.infinit.net/graxx