RE: Highlight TVI Not Accurate in Profile
RE: Highlight TVI Not Accurate in Profile
- Subject: RE: Highlight TVI Not Accurate in Profile
- From: Roger Breton <email@hidden>
- Date: Fri, 30 May 2014 20:20:17 -0400
I wanted to wait before jumping on this thread.
I think Steve explained why "curves" or "TVI" derived from colorimetric information has limited value in interpreting the extreme highlights of a typical 2% flexo dot (what, you can't hold a 1% dot yet?). If you are trying to coax a CGS rip to show the "correct" color appearance for that 2% highlight dot through their curves adjustments, hoping to "reverse-engineer" the TVI from your press characterization, so you have the required data to "plug" into the curves, it won't take you very far. Why don't you approach the problem on strict colorimetric ground? You have the CIE Lab values for the 2% dot for each process colors, why don't you just edit the Color Correction (cc) file to yield the required appearance on the proof?
It's going to require manually iterating the color but you'll eventually nail it as close as the CGS percentages will allow you to.
Roger
-----Original Message-----
From: colorsync-users-bounces+graxx=email@hidden [mailto:colorsync-users-bounces+graxx=email@hidden] On Behalf Of William Whitfield
Sent: 29 mai 2014 11:54
To: ColorSync-users
Subject: Highlight TVI Not Accurate in Profile
Greetings,
FYI - I recently posted this to Print Planet. I am a flexo printer and have created a profile using iProfiler for a poly stock which has a very high TVI. In order to make an accurate proof I had to build what I would call, an extreme gradation in my CGS proofing workflow, which led me to believe the profile is not accurately reporting my highlight TVI.
I checked the TVI on press sheet with a 530; in ColorAnt using the measurement file; and, in ColorThink using the profile. ColorAnt matches the TVI in highlights that the press printed, but the profile in ColorThink does not. Here is the data for cyan:
1.96%:
ColorAnt 26%
Press 24%
ColorThink 7% @1%, 13% @2%
2.75%:
ColorAnt 30%
Press 29%
ColorThink 14% @2%, 20% @3%
4.71%:
ColorAnt 36%
Press 35%
ColorThink 27% @4%, 32% @5%
I have had some feedback as to why this is happening, but would appreciate some more. Additionally, is editing the profile in something like Profile Editor, which I still own, the only way to fix this. In my limited experience using iProfiler I do not see a way to make edits such as these to a profile.
Thanks.
-Bill-
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