2010/3/29 Fabrizio Levati <fabrizio.levati@xxxxxxxxxxxxxx>: > What am I doing wrong? You're doing nothing wrong. Graeme explained why the curves appear the way they do. I also tried tweaking the -kp parameters to get rid of the "bump" without luck. Having used both ProfileMaker and PrintOpen where the set black curve is more strictly met colprof's behaviour is sometimes confusing (not meaning it's wrong). I have suggested some other methods to set the black curve (//www.freelists.org/post/argyllcms/request-colprof-black-generation) and in addition to that colprof could have a parameter for degree of adherence to the set black curve. As a result of using this parameter, potentially introduced non-neutrality could be reported in stats for a*, b*, C*, h*, H* and delta E. Martin Weberg