[argyllcms] Re: 0.60 CMYK profile misshaped

  • From: Gerhard Fuernkranz <nospam456@xxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Fri, 08 Dec 2006 23:48:09 +0100

> > Actually I'm still a bit sceptic regarding the shaper/matrix/shaper
> > optimized curves. In many cases they seem to work very well, but
> > I also encountered data sets, where "-ni" or "-ni -no" did result in
> > better accuracy.

Graeme, btw, the epson_760_glossy.ti3 data set posted by Mike Russel is
an example for a profile whose quality seems to be rather spoiled by the
shapers, wrt. the self-fit error, and also wrt. the estimated
generalization error (cross validation).

Shapers + CLUT (-qh):
profile check complete, peak err = 5.922979, avg err = 1.845065
GCV: 4.6 RMS

CLUT only w/o shapers (-qh -ni -no):
profile check complete, peak err = 3.598966, avg err = 1.270233
GCV: 2.5 RMS


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