Hi 2009/11/9 Graeme Gill <graeme@xxxxxxxxxxxxx>: >> OK - maybe my inkjet's unusual there, then - but it seems as though the >> a/b loci will curve significantly, and even double back on themselves while >> L* continues merrily decreasing. See: >> >> http://blackfiveimaging.co.uk/temp/Tesco1107_InputVsLab.jpg >> and >> http://blackfiveimaging.co.uk/temp/Tesco1107_abPlane.jpg > > Right, but why is this a problem ? Non-monotonicity in the a*b* plane > doesn't imply non-monotonicity in L*a*b*, and the linearization will > take care of making the locus uniform, while profiling > takes care of what each colorant and the combinations of colorant > are doing. [i.e. do you have an example of this causing a problem > or some theory as to how this can cause a problem ? ] If for some reason I want to print unprofiled (yet calibrated), those "hue-hooks" at the end could be a potential problem. Of course then I could override defaults using -x option. Martin Weberg