Several software solutions for hardcopy proofing already do this. From a pure profile standpoint, GMG Colorserver does this (proprietery though)…perhaps something from ORIS as well, but I’m not sure. AFAIK, this is not Colorthink’s gig.
Mike
-----Original Message-----
From: jstotz
To: ColorThinkForum@colorforums.com ColorThinkForum@colorforums.com
Sent: Mon Jun 15 20:08:04 2009
Subject: Iterative Lab to CMYK conversion
I wonder if someone can tell me if ColorThink can do the following, or if not, is there some software that can?
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Read, enter, or import Lab values for some color swatches. These could be ink draw-downs or swatches from a customer’s spec sheet or the Pantone book.
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Come up with a suggested CMYK build for these swatches using an ICC profile, probably the GRACoL profile.
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I would then build a page in Quark with swatches that used these initial builds and print it out on our GRACoL calibrated Epson proofer.
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I would read in these swatches from the Epson with an EyeOne and enter these new Lab values.
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I would need the software to compare the initial Lab values with the new Lab values, tell me the delta-E, and suggest new CMYK values that would be a closer match.
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I would then repeat steps 3-5 several times until the delta-E numbers got low enough.
The hard part is that I need the software to be smart enough to say “I know I recommended some initial values, but I can see that they didn’t quite do it, so judging from the Lab values they actually produced, here is a new recommendation that should be closer”.
Thanks,
Jamie