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: Marc Levine <email@hidden>
- Date: Mon, 28 Aug 2006 21:47:50 -0400
- Thread-topic: Pre-Linearization or Iterative Profiling (WAS Re: Printer profile mis-shape?)
Marco,
I'll add one more thing and then invite you to contact me offline for any
additional clarity. Any time you measure your device output - in any
condition - that is a representation of the device's true behavior.
When you build a calibration, you are simply measuring the current condition
(whether it is in a raw state, or has been configured to some type of
printing behavior such as a density-based lin).
With the measured data in hand - and a definition of a target behavior - you
can compute a correction curve. In the case of MP, the target behavior in
"linear" and metric of that line is dE. So, what MP tries to do is define
curves for each channel that will cause a uniform spacing of dE as the
printer increases the ink level flowing to the media.
Profile targets are typically built from grids of color patches. On these
grids, the system levels are typically evenly dispersed. However, when these
patches are rendered into Lab (measured), they can have a less uniform
spacing. By linearizeing to dE (in MP), this ensures that the evenly spaced
grids of color patches on your target result in a colorimetrically uniform
sampling of the lab space that you are characterizing with the profile.
More uniform sampling provides a data set for the profiling engine that is
more regular, and from which the profile can construct a model (profile)
that exhibits better detail and balance.
Signing off on this issue. Please contact me off line if I can clarify
further.
Best regards,
Marc
Marc Levine
Sales/Technical/Marketing....guy.
X-Rite Incorporated
email@hidden
www.xrite.com
>
> Yes, Marc, I see that I didn't put it quite well there. It's still a bit
> nebulous to me. What I understand (and I hope I'm on the mark) is that the
> adjusted color patches produce device colors in the printed target that more
> closely mirror the true behavior of the device.
>
> Thank you for the reply.
>
> --------------
> Marco Ugolini
> Mill Valley, CA
>
>
>
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