[argyllcms] More Argyll experiments...
- From: Roger Breton <graxx@xxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sun, 13 Jul 2008 10:33:25 -0400
I am trying to use my iCColor with Argyll "native" device sampling
capabilities, the one that comes out of using targen and printtarg. I'm
convince that Argyll's flexible device sampling capabilities is superior to
standard characterization targets like TC3.5 or IT8.7/3-4 or ECI2002x.
Ultimately, I'd like to experiment with VLS (Very Large Size) sampling like
3000 patches or so.
I know the iCColor is not directly supported in Argyll but there are many
ways around this. One of them is importing the *.ti1 file into X-Rite
Colorport and selecting the iCColor as the measuring instrument.
So, I proceeded yesterday to make some simple trials.
I ran the 836 basic CMYK patch set onto my Epson printer, printing through a
GMG RIP and massage the measurements into Excel in a *.ti3 file format.
I made the profile and basically got this result :
> peak err = 4.069414, avg err = 0.709971
Not having done enough profiles with Argyll I wasn't sure how to interpret
this result. So, I made another profile, this time through the logo2cgats
pipeline, importing the measurement of TC3.5 patch set and got this result :
> peak err = 3.486184, avg err = 0.719071
As you can see, the avg err are identical. But not the peak err.
I want to continue down this path but I need to confirm that my
interpretation of these statistics is correct.
So, am I right to conclude that, strictly speaking, the profile made from
the TC3.5 dataset "fits" the measured data slightly better than the profile
made from Agyll's base 836 patches dataset?
I need to explore the options in targen as far as spatially sampling the
device space differently. I remember creating a *.wrl file at the same time
as generating the *.ti1 file and later viewing the result in Cortona on
Safari and noticing some "discontinuity" into what appeared like the XYZ
"cube". By discontinuity I mean, missing sampling points along the axis, for
example. Discontinuity is probably not the best word to describe what I'm
seeing, so please, take it with a grain of salt.
Roger Breton
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