[argyllcms] Re: RGB Printer profiling and ColorSavvy CM2C
- From: Gerhard Fuernkranz <nospam456@xxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sat, 30 Jul 2005 17:06:42 +0200
Roger Breton schrieb:
Does Argyll have to generate the target itself,
Argyll has to generate the target, no question.
Not necessarily, if you manage to create the .ti3 file somehow manually
(e.g. with your own tools, or with the logo2cgats utility, which
converts GMB measurement files to .ti3 format, or howsoever). In order
to create the profile, you ONLY need the .ti3 file, containing both the
device values and the colorimetric/spectral measurements of the patches.
Nevertheless, IMO targets generated by Argyll, especially if they have
been created for a particular device ("targen -c profile.icm ..."), give
higher overall characterization accuracy, with a lower number patches,
than other targets with a fixed layout. IMO an Argyll generated target
with 1500 CMYK patches outperforms e.g. the ECI target, which has
approx. the same number of patches.
What I'd like to do is use a sparse scattering of patches, and then
augment this in the "difficult" areas, adding some extra patches down
the grey axis and in typical skin tones.
Hmmh, I'm not sure argyll can do that. Graeme?
You can add additional measurement manually to the .ti3 file - no
problem. And you can obviously even increase the weight of particular
measurements by adding them multiply to the .ti3 file. But at present
there is no tool to assists this task.
You can e.g. also create a .ti1 file manually, containing only the
patches you want to augment, print this augmentation target as usual
with "printtarg ...", and measure it in order to create a .ti3 file.
Then you add the measurements from this .ti3 file to the original .ti3
file manually with a text editor, and recreate the profile.
For example, to create the contents for the table in the .ti1 file to
augment patches along the gray axis for an RGB device you could do
something like
$ perl -e 'for $i (20..99) { print "$i 0 0\n" }' |
xicclu -pl -ir -fif profile.icc |
awk '{ print $8, $9, $10 }' |
icclu -px -ir -ff profile.icc |
awk '{ print ++i, 100*$1, 100*$2, 100*$3, 100*$8,100*$9,100*$10 }'
Regards,
Gerhard
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