[argyllcms] Re: printer profiling is giving strange results usingversion 1.1.0
- From: rik <rik@xxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 3 Feb 2010 18:42:02 +0100
I did a complete reinstall of the argyll ppa package and now I cannot
reproduce the problem anymore.
-rj
On Wednesday 03 February 2010 04:43:10 Graeme Gill wrote:
> rik wrote:
> > Is it OK that after creating a new target with
> > targen -v -d2 -G -f 1170 -c RGB_C530dn_1.icc -A.8 RGB_C530dn_2
> > and repeating the profiling process I get a slightly higher error:
> > Profile check complete, errors:
> > max. = 9.280208, avg. = 2.041050, RMS = 2.375842
>
> I'm not sure. A possible explanation is that the pre-conditioning
> with a previous profile distributes more points where curvature is high,
> so that these regions get better characterized. But the smoothing used
> in creating the profile tends to smooth out curvature, so the detail
> revealed by the test point placement has a greater fit error.
>
> [Note that there are some bits of the documentation that I haven't
> properly updated in relation to the targen -A option. It's now setup
> so it should do the right thing when you supply a profile to -c,
> and will set an adaptation level of 1.0. You would now only override
> this if you decided that it is not helping, or perhaps that
> the previous profile doesn't represent the device behavior very well.]
>
> > As far as i can say now, it seems that targen from the ppa is/was faulty.
>
> Disturbing, but all too common I'm afraid. I wonder if that is a result of
> code changes or the compile environment.
>
> Graeme Gill.
>
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