Re: Creating Proofs for ISO Coated & FOGRA Proof Verification
Re: Creating Proofs for ISO Coated & FOGRA Proof Verification
- Subject: Re: Creating Proofs for ISO Coated & FOGRA Proof Verification
- From: Terry Wyse <email@hidden>
- Date: Thu, 14 Dec 2006 18:07:07 -0500
On Dec 12, 2006, at 1:48 AM, Joseph Yates wrote:
In my latest calibration with the ORIS Color Tuner / ORIS
PearlPROOF Super
paper / K3 inks / Epson 9800 - I am getting an Avg dE .81 / Max dE
5.15
after 3 iterative calibrations. Already my proofs look much closer
than the
ones I've just received from my Asian printer's high end digital
proofer.
I would think you should be able to get better numbers than those.
ORIS Color Tuner and GMG are pretty much peers in the inkjet proofing
RIP world. Using GMG to the GRACoL2006 version of the ISO Coated
specs, I regularly see dE values of < .50 average < 3.0 peaks.
My next step is to modify the background paper simulation as it
looks as
though it is adding a bit of cyan to the PearlPROOF Super paper
background.
I'm curious as to the reason why?
CIElab Measurement of the ORIS proofing paper = L*96.4 a* -0.2 b*-1.1
There's your answer. If your proof paper is a*-.2 and b* -1.1, then
it's slightly yellower than ISO Paper Type 1 (a*0 b*-2.0). It's
adding a cyan dot to make it bluer to match the press stock.
In regards to tolerances, there's a few things to consider. One is
proofer *calibration* tolerance and the other is dE tolerance to a
specification such as Fogra27 and ISO 12647-2. Calibration tolerance
should be MUCH tighter than the pass/fail tolerance to a
specification. I would think calibration tolerance should be <1dE
average and perhaps 3 dE peak while tolerance to a specification
should be more like 3 dE average and 5 dE peak.
Regards,
Terry Wyse
_____________________________
WyseConsul
Color Management Consulting
G7 Certified Expert
email@hidden
704.843.0858
http://www.wyseconsul.com
http://www.colormanagementgroup.com
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