1. i1Profiler profiling (graxx@videotron.ca) ---------------------------------------------------------------------- Date: Sun, 02 Jun 2019 12:48:37 -0400 From: graxx@videotron.ca To: colorsync-users@lists.apple.com Subject: i1Profiler profiling Message-ID: <00e901d51963$0845b360$18d11a20$@videotron.ca> Content-Type: text/plain; CHARSET=US-ASCII
This is probably a simple question but I have to ask.
I'm using a Colorburst RIP to convert from, say, GRACoL2006_C1 to my Epson printer. I use i1Profiler to generate both profiles.
I'm using Epson Standard Proofing 240 paper, which has "nominal" CIE Lab coordinates equal to 95.00 0.00 -2.00 :
https://epson.com/For-Work/Paper/Pro-Imaging/Standard-Proofing-Paper-(240)/m /S045112
GRACoL2006_C1 official spec has this Media White Point for the substrate :
95.00 -0.03 -1.93
My Epson paper CIE Lab coordinates, as measured with a Minolta FD-9 (M0 vs M1 vs M2 is all the same), turns out :
94.00 0.22 -1.78
Not "far".
I insist on setting the Rendering Intent in the RIP to Absolute Colorimetric but I end up with some fractional Cyan dot percentage on the output (0.4C 0.0M 0.0Y 0.0K)?
I don't suppose there is a way to "force" the Media White Point to remain "zero" through any one of i1Profiler's Advanced profile generation option?
I noticed i1Profiler has a drop down menu called "Profile White Point" (not documented anywhere I found?) among its myriad of profile generation settings. It offers:
- Default (Recommended);
- Custom (which lets me enter any CIE Lab coordinates I care)
- From saved ICC profile (not useful in this case, as far as I can see?)
- From saved measurement (not useful in this case, as far as I can see?)
I know some RIPs offer the option to keep "Zero" at "Zero", on output, but wonder whether it can be done at profile generation time through i1Profiler?
In the past, I managed to do this through "editing curves" in the printer profile with HDM ColorToolbox, in the Edit tab (may have to resort to the same "trick" this time again.) or through the Proof Correction tab (they have a specific option called "Keep paper white") which allows iterating down a pair of CMYK to CMYK profiles conversion.
Any help is appreciated.
/ Roger Breton www.graxx.ca
It’s a bit strange that you don’t get much different reads on M1 than on M0 (M2 I don’t think apply here). There seems to be quite considerable amount of OBA in the paper. But I don’t use i1Profiler much, actually still use the old ProfileMaker under Windows through Parallels. There is a nice old feature to modify the whitepoint of the profile if you are not happy with the result. But if you get bluish whitepoint in your proof, it means the CMM try and overcompensate for what it thinks is a too yellowish printing paper (if my logic is right here). But modifying the whitepoint is a bit of a cheat, so you should probably try and get it right using the generated ICC-profile "as is”. Any help from X-Rite? /Paul L, Digital Dots