Mike,
I have created a proof that the printer may have an easier time "matching"; but can I say that this proof adheres to GRACoL specifications?
when you replace GRACoL with FOGRA the answer is No. Since a proof is intended for a side-by-side evaluation. And the obvious paper difference that you "calculate to 0" is still there when you compare it. you are entering a field which I call media relative colour reproduction (where reproductions are assessed in isolation). And here your approach is valuable. But if you confuse both approaches (Side-by-Side versus media relative) you will enter a lot of problems .... sincerely Andy PS: You might check put the PSD (Process Standard Digital) handbook, where provisions (from print buyer to the service provider) are made for both colour reproduction types. On Oct 18, 2012, at 4:30 AM, Elie Khoury wrote:
Mike, We have now a method to adjust data sets and take into account actual paper color vs reference data set paper color. I encourage you to use this method named "Substrate Corrected Colorimetric Aims (SCCA), validated by Prof. Chung from RIT, and recognized in CGATS 021 and ISO 15339 drafts. Once your data set is adjusted using the actual paper color, you can build your new ICC profile. Kind Regards, Elie Khoury --------------
On Oct 17, 2012, at 19:39 , Mike Stewart wrote:
With papers changing the way they are; most do not fall within the tolerances specified in 12647-2. I like this idea of the Substrate Calculator. My question is this. Let's say we proof to GRACoL tolerances on a paper that is within the specification. We now get a #1 or #2 paper that is out of spec. I use the calculator, create a new CGATS file and create a new ICC Profile. I use CGS ORIS Color Tuner and hone in my proofing device (Indigo press) to within tolerance and proof my files/images on the "new" paper. What have I achieved. I have created a proof that the printer may have an easier time "matching"; but can I say that this proof adheres to GRACoL specifications? If you were to read the 12647 color bar it would pass only if I have the proper dataset loaded to compare to using software such as ORIS Certified Proof. Someone else checking my proof to GRACoL would say it "fails" because they would be comparing to the "original GRACoL". What exactly have I accomplished and how can it be classified as a specification.
Mike Stewart
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