Hello@all, I've done some comparations between argyll cmyk profiles and results from various commercial vendors. The current gamut mapping is imho the absolute nr. 1. I recalculated fogra39 profiles. Saturated colours are very pure (especially cyan and magenta) with good detail reproduction. The transition of tonal values is also excellent, smooth without shiftings. All in one a really great work. Still, there is a lot of experiments to be done yet :) I plan also a few tests on a real-life printing press, also in comparision with commercial solutions. I'll report... Regards Vladimir -- Gesendet von meinem Palm Pre Graeme Gill <graeme@xxxxxxxxxxxxx> schrieb am 03.08.2010 15:21: Nikolay Pokhilchenko wrote: > About new gamut mapping - it is the other thing now. I've noticed that the saturated > areas go datrker than before at my inkjets. The improvement: the gradients with extreme > saturation of colors are more balanced by tone between its ends. But the darkness of > saturated colors are the drawback in some situations. I think that in general, new > mapping is better, than the old one. But I should expriment and work more to understand > the behavior of new mapping better. Hi, One of the fundamental choices in setting the gamut mapping is the the trade-off between lightness and saturation. Typically the gamut mapping task is RGB to print, and because these are additive and subtractive processes respectively, the most saturated colors for print are usually much darker than RGB. So if you maintain lightness, you can loose huge amounts of saturation (this is often very noticeable in cyan), or you have to darken the tones to maintain a better degree of saturation. In V1.2.0 I've opted for a little more saturation at the cost of lightness. (You could tweak this by changing the gamut mapping numbers and recompiling.) Another factor may be that in V1.2.0 I've paid much more attention to maintaining the lightness level of darker colors and not lightening them up during the mapping, in order to maintain the visual detail (The visual detail is often conveyed by shadow details). Graeme Gill.