Re: Pre-Linearization or Iterative Profiling (WAS Re: Printer profile mis-shape?)
Re: Pre-Linearization or Iterative Profiling (WAS Re: Printer profile mis-shape?)
- Subject: Re: Pre-Linearization or Iterative Profiling (WAS Re: Printer profile mis-shape?)
- From: "Mike Eddington" <email@hidden>
- Date: Fri, 25 Aug 2006 10:20:15 -0400
- Thread-topic: Pre-Linearization or Iterative Profiling (WAS Re: Printer profile mis-shape?)
> Does pre-linearization relate to what I have seen described as "iterative
> profiling"? One way that I recall being described to do this is, after a
> normal testchart/measure/profile sequence, to print a second testchart, using
> the first profile (instead of sending the raw data), and then re-measure, and
> re-profile.
pre-linearization and "iterative" profiling aren't really the same thing, and I'm not sure I follow what you're describing (sounds more like post-linearization), but in Monaco Profiler for example, you have the option of pre-linearization prior to profiling. This is actually Lab linearization of the test chart; gathering data that will then be used to create a test chart that will have more evenly distributed Lab values upon measurement (rather than evenly distributed CMYK values of the test chart). So instead of altering the devices response, it creating a new patch set that will more effectively characterize its behavior.
>In my experience, though, no more than two or
three iterations can be used before the results of further iteration start
to worsen the simulation.>
I have seen cases where taking iteration too far has a detrimental effect, but with the current version of GMG Colorproof, I can make 5, 6 or more iterations with no degradation of the profile. No real benefit visually mind you, but numerically, some higher delta E values will continue to improve (if the gamut allows). Keep in mind that the tolerance can be set to only iterate values above a certain delta E as well, so those values remain unchanged
Michael Eddington
North American Color, Inc.
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