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&
