Thank you for the information!
/ Roger Breton
www.graxx.ca
From: argyllcms-bounce@xxxxxxxxxxxxx <argyllcms-bounce@xxxxxxxxxxxxx> On
Behalf Of Martin Gray
Sent: Sunday, January 23, 2022 1:22 PM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] I1Patches. A tool to more accurately evaluate profile
patch sets with less work
I've posted this program on github https://github.com/doug3236/i1Patches
It's designed to work with CGATs RGB and Measurement files,
**In a single printing pass, create and verify accuracy of one or more ICC
profiles from one or more sets of RGB profiling patches.**
i1Patches Is a Windows based tool principally used to aggregate and
randomize one or more,
printer profiling patch sets along with randomly generated patches for
independent accuracy verification.
It produces tif and CGATs files compatible with XRite's i1Profiler and
i1iSis or i1Pro2
spectrophotometers.
It is particularly good at removing externalities that strongly affect
comparing different profile
patch sets. These have been typically evaluated by printing charts,
measuring patch color,
making profiles, printing sets of known colors with these profiles, and
finally, measuring these prints
and comparing mesasured colors to patch RGB value colors.
The following can, and does, make this usual practice difficult and
uncertain:
I've seen these effects result in a 500 patch profile appearing to be more
accurate
than an 1,800 patch profile.
- Environmental variations such as changes in temperature and humidity that
change the dynamics of dot size as ink drys.
- Printer variations that occur between successive page prints from warmup.
Inking differences as
new ink flows out of cartridges, through supply tubes, and into the print
head.
- Print head technology. Canon and Epson heads differ and have different
drift characteristics through a print job.
- Printer algorithms. An example is when the printer decides it's time to
jiggle the inks
partway through a print job. I've noticed on the Canon Pro1000.
- Paper characteristic changes. Each page may not ink the exact same way due
to manufacturing or storage variation.
For example the first page in a paper package can exhibit significant
shifts on papers with high OBA levels
due to more air exposure.
