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Re: CGATS text file from a profile
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Re: CGATS text file from a profile


  • Subject: Re: CGATS text file from a profile
  • From: Matt Louis <email@hidden>
  • Date: Thu, 03 Mar 2011 12:08:30 -0600
  • Acceptlanguage: en-US
  • Thread-topic: CGATS text file from a profile

Steve,

Yes. Editing a whitepoint in an ICC profile will skew the characterization data synthesized from it towards the new paper color. Mileage may vary if this is a good thing because the way paper color filters through the patches may not reflect the reality of printing.  The 100c 100m 100y 100k is a good example because in reality this patch would not change color merely by changing paper shade.  You'll have to decide if within Curve you want to target skewed beta data for KCMYRGB from a modified profile or aim for original characterization data aimpoints, less the paper color and near-neutral gray rendering. The differences may be negligible depending on how fussy you are. I do not know that there is a right or wrong to either approach.  My approach is to target the original print specification aimpoints as closely as possible on press and then do what I can to get the proofs to match what is happening on press. Perhaps if I followed the modify-press-target-approach I would have better luck hitting Magenta tolerances. Heck, I could just make my press results for become the new reference. My problem with this is that is creates a situation where we can no longer say we are printing to globally accepted print specifications, rather we are targeting color "based on" print specifications.

I wish we had uncoated print specifications for paper we can readily buy. My understanding is OBAs are messing up proofing so the standards bodies are hesitant to adopt real-world papers for offset uncoated until workable solutions become widely available.

Matt Louis
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References: 
 >Re: CGATS text file from a profile (From: Steve Miller <email@hidden>)

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