Hi Mike, The purpose of the substrate calculator is to generate more realistic data for non-standard paper. So, IMO, you'd be deviating from Gracol data by going outside the specification, but gaining data that is more realistic given the differences in substrate. A recipient of a proof using this new data may or may not be on board with this deviation, so you should have the conversation up front. Hope that helps, Mike Sent from my iPhone On Oct 17, 2012, at 1:52 PM, Mike Stewart <mstewart@embassygraphics.com> 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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