Check your manual, it tells you how to do the calibration and you should have
done this during the set up process. For what it's worth, my own profiling
workflow is to make an initial profile using a 924 patch set (two letter size
pages). I use this profile as a pre-conditioning profile for the final
profile. I use a 1848 patch set for that (four letter size pages) with a 51
step B/W patch set as I do a fair amount of monochrome printing (the Argyll
command is '-g51'). I also bump up the neutral axis command ('-N0.6'). I have
the same Canon printer and have found this work flow works well for all the
papers I print on. I use mainly Moab papers: Entrada Natural 300; Somerset
Museum Rag; and Juniper Baryta Rag. I used to print on Museo Silver Rag, but
they have changed ownership several times and I had some quality issues with
the paper.
I have never encountered an issue of prints being too dark.
Alan
On Saturday, March 19, 2022, 05:22:31 PM EDT, Yves Gauvreau
<gauvreauyves@xxxxxxxxx> wrote:
Ben,
you got me there, I thought this calibration thing was only for cmyk printer.
I'll look into this for sure.
targen
Generate Target deviceb test chart color values, Version 2.3.0
Author: Graeme W. Gill, licensed under the AGPL Version 3
usage: targen [options] outfile
Diagnostic: Too few arguments, got 0 expect at least 1
-v [level] Verbose mode [optional level 1..N]
-d col_comb choose colorant combination from the following:
0: Print grey
1: Video grey
2: Print RGB
3: Video RGB
4: CMYK
5: CMY
6: CMYK + Light CM
7: CMYK + Light CMK
8: CMYK + Red + Blue
9: CMYK + Orange + Green
10: CMYK + Red + Green + Blue
11: CMYK + Orange + Green + Blue
12: CMYK + Light CMK + Light Light K
13: CMYK + Orange + Green + Light CM
14: CMYK + Light CM + Medium CM
-D colorant Add or delete colorant from combination:
(Use -?? to list known colorants)
-G Generate good optimized points rather than Fast
-e patches White test patches (default 4)
-B patches Black test patches (default 4 Grey/RGB, else 0)
-s steps Single channel steps (default grey 50, color 0)
-g steps Grey axis RGB or CMY steps (default 0)
-n steps Neutral axis steps (based on profile, default 0)
-m steps Multidimensional device space cube steps (default 0)
-M steps Multidimensional device space cube surface steps (default 0)
-b steps Multidimensional body centered cubic steps (default 0)
-f patches Add iterative & adaptive full spread patches to total
(default grey 0, color 836)
Default is Optimised Farthest Point Sampling (OFPS)
-t Use incremental far point for full spread
-r Use device space random for full spread
-R Use perceptual space random for full spread
-q Use device space-filling quasi-random for full spread
-Q Use perceptual space-filling quasi-random for full spread
-i Use device space body centered cubic grid for full spread
-I Use perceptual space body centered cubic grid for full spread
-a angle Simplex grid angle 0.0 - 0.5 for B.C.C. grid, default
0.333300
-A adaptation Degree of adaptation of OFPS 0.0 - 1.0 (default 0.1, -c
profile used 1.0)
-l ilimit Total ink limit in % (default = none)
-p power Optional power-like value applied to all device values.
-c profile Optional device ICC or MPP pre-conditioning profile filename
(Use "none" to turn off any conditioning)
-N nemphasis Degree of neutral axis patch concentration 0.0-1.0 (default
0.50)
-V demphasis Degree of dark region patch concentration 1.0-4.0 (default
1.00 = none)
-F L,a,b,rad Filter out samples outside Lab sphere.
-O Don't re-order display RGB patches for minimum delay
-U Don't filter out duplicate patches
-w Dump diagnostic outfilel.x3d.html file (Lab locations)
-W Dump diagnostic outfiled.x3d.html file (Device locations)
outfile Base name for output(.ti1)
I've mark in red the lines of interest, I suppose these option are not there
for nothing. If I understand correctly, these are there so colprof as more data
in those region to make smoother and or cleaner transition.
Could we assume the same would be true for specific colors as well?
The number of white, grey and black patches how significant are these.
By the way, yes it's a Canon ImageProGraf Pro-1000.
I'm curious about the XYZ values that are put in with the RGB values, these I
understand but base on what conversion are these XYZ values?
Thanks,
Yves
On 3/19/2022 4:24 PM, Ben Goren wrote:
On Mar 19, 2022, at 4:00 AM, Yves Gauvreau <gauvreauyves@xxxxxxxxx> wrote:
Any other suggestions to create an excellent target?
Especially since you’re starting from such a strong position, with an
extremely well-behaved printer (assuming it’s an improvement on the
already-great iPF8100, which I’ve no doubt it is), you shouldn’t have to worry
much.
I’d fill a sheet with patches. (If printing from a roll, fill the width of the
roll; no need to waste paper.) If you’ve already got a not-bad profile from
that printer on a similar paper (glossy / matte / baryta / uncoated with or
without FWA; don’t need to get more fine-grained than that in your definition
of “similar”), then feed it to targen for pre-conditioning.
The resulting profile will be excellent.
If you want to aim for overkill, feed that profile to targen, and then build a
profile with the measurements from *BOTH* charts.
After that, assuming profcheck indicates a good fit, I would assume that the
printer profile is as good as it gets unless you have reason to think otherwise.
(Of course, this assumes you’ve first done all of Canon’s linearization stuff,
etc., which I’m certain you already have.)
b&
