[argyllcms] Re: Number of patches - well behaved printer?

  • From: Vittorio Villani <vittoriovillani@xxxxxxxxxxx>
  • To: ArgyllCMS List <argyllcms@xxxxxxxxxxxxx>
  • Date: Tue, 22 Feb 2011 13:04:44 +0100

Hi Terry.

I have asked a very similar question on this mailing list without getting an
answer. I was asking not only the “best number of patches” but also the “best
kind of patches”: 

I am now using a ColorMunki, an i1Pro and many Epson printers in RGB mode
(R2400, 4880, 7900).

What I can tell you is this:

1) I had the best result using a number of patches between 2000 and 2500 with
the following command:

targen -v -d2 -G -f2500 -g128 name

On the targen page: http://www.argyllcms.com/doc/targen.html
you can find a description of every parameter I used.

The K3 and HDR inks should be very “stable” (so the behaviour of this printers
is very stable over time also if they are not calibrated). I have no experience
with less-stable inks so I can’t tell you if I would use a different number of
patches. For what I could understand and see in my prints with the Epson
printer that I use I have notice no change over time, so I consider that, using
the same driver settings, I will get a good “calibration” of the printer (the
profile will be good because the printer will behave always in the same way if
the driver is properly set). 

2) With the ColorMunki you can read the i1Pro patches using a ruler: 
in the description of this video that I made you can find information about how
to print and read the target. In this way you are going to save paper.

3) To improve your profile you can also “re-read” the defective patches
following the procedure that you can find here: 
With the –r parameter in chartread http://www.argyllcms.com/doc/chartread.html
you can read again the patches that have the worst error in profcheck until you
get an average and max error that makes you happy. I could get profiles with
max DeltaE 2000 error in profcheck of 0.9.

Have a nice day.

Vittorio Villani

Date: Mon, 21 Feb 2011 16:19:37 -0600
Subject: [argyllcms] Number of patches - well behaved printer?
From: t.ritz@xxxxxxxxxxxxx
To: argyllcms@xxxxxxxxxxxxx

Corpo del messaggio

I’m working with a ColorMunki, profiling papers for my new Canon 8300. The 8300 
has built in calibration technology and as such, it should be reasonably well 
behaved. I’m printing on cotton rag matte papers, a fine art baryta gloss paper 
and canvas.

How many patches would you suggest using in my targets? 

Out of curiosity, how many patches would you use for a less well behaved 
printer, say an older pigment ink printer?

Many thanks.


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