[argyllcms] Re: colink helpful U/GCR and TAC options
- From: Kai-Uwe Behrmann <ku.b@xxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 15 Oct 2008 12:34:03 +0200 (CEST)
Am 15.10.08, 10:59 +0200 schrieb Martin Weberg:
> 2008/10/15 Kai-Uwe Behrmann:
> > xicclu gives attached gray curves back for below suggested -kp + -l300 and
> > FOGRA29L.txt (uncoated). The screenshot appears not to be very smooth.
>
> I used FOGRA39L.txt (coated) and I think (I have not tested it) the
> uncoated dataset need other -kp values. Then I made a preliminary
> profile:
> colprof -v -ql -b -no -ni FOGRA39L.ti3
> then
> xicclu -g -kp 0 .3 .94 .94 .48 -l300 -fif -ir FOGRA39L.icc
> output looks like the attached file. I could not get it any smoother.
>
> I never made an icc-profile using these parameters, beleaving it would
> be similar.
The right side of the graph seems to show the dark side. So it basically
tells about Argyll's out of gamut behaviour, which is not that important.
The left side is ok in this graph.
> > How important are the gray response curves of the profile?
>
> I have built profiles for inkjets and if the curves are too spikey or
> CMY drops too early/sudden onto the K ramp (before K levels out) I
> often get banding in the gray ramp output as result.
Thanks.
kind regards
Kai-Uwe Behrmann
--
developing for colour management
www.behrmann.name + www.oyranos.org
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