[argyllcms] Re: How to improve an RGB printer profile using ti2 and ti3 files
- From: Vittorio Villani <vittoriovillani@xxxxxxxxxxx>
- To: ArgyllCMS List <argyllcms@xxxxxxxxxxxxx>
- Date: Tue, 21 Dec 2010 11:11:48 +0100
Thanks for the nice suggestions.
I noticed that I have some high DeltaE patches in some profiles I made, but I
had no problems in reading them again.
I had a problem in re-reading with -r but, as you told me, I probabily used one
time the -H parameter and the other time I didn't.
Anyway I could manually edit the .ti3 file using a new .ti3 file with the new
readings and the profile works with a maximum DeltaE of 1.6.
The idea of printing the patch location in profcheck seems very nice :).
Vittorio Villani
> Date: Tue, 21 Dec 2010 11:55:25 +1100
> From: graeme@xxxxxxxxxxxxx
> To: argyllcms@xxxxxxxxxxxxx
> Subject: [argyllcms] Re: How to improve an RGB printer profile using ti2 and
> ti3 files
>
> Vittorio Villani wrote:
>
> > 1) When coloprof "see" a patches with an high DeltaE2000 will the patch be
> > ignorerd?
> > What is the effect of this kind of "reading error" in the final profile?
>
> No, since this is the self fit error, and is know only after the profile is
> complete.
> There is no criteria to judge the rejection of such a patch either - it might
> be a
> perfectly valid measurement that reflects the device/instrument behaviour, and
> the error value may simply be representing a poor fit between the
> interpolation/smoothing
> model and the data.
>
> > 2) Is it possible to manual edit the .ti3 file before I give it as input in
> > colprof, to
> > change the values of the patches that I don't like with new readings? Is
> > this an
> > "intelligent" thing to do or not? I am sorry but I am trying to learn and I
> > could find
> > no clear explanation on this. What I would like to do is to read again, for
> > example,
> > patch number 934 in spot mode and put it in the .ti3 file.
>
> Yes, you can either re-read particular strips or patches, or delete them from
> the .ti3 file. You simply have to delete the appropriate line, and adjust the
> "NUMBER_OF_SETS" appropriately. You should only be doing this if you judge
> that
> the reason for the high fit errors is a bad reading. Such a bad reading may be
> due to the instrument not being properly positioned (ie. off line, or not
> against the paper), or a failure of the software to distinguish the patch
> boundaries.
>
> > Now I don’t know how to read again this patch (I can use the ColorMunki
> > program, but I
> > have L*a*b* values as output) and how to “put” the new values in the .ti3
> > file.
>
> If you are using chartread, you can use the -r option to "resume" reading the
> chart.
> If you want to read single patches, use the -p option as well. (You can use
> 'F' and 'B' to move forward/backward 10 patches at a time.)
>
> [I'll change profcheck in the next release to print the patch location, so
> that
> you don't have to look inside the .ti3 if you want to re-read the patch.]
>
> Graeme Gill.
>
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