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Re: Re Ink jet ink linearization and limiting
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Re: Re Ink jet ink linearization and limiting


  • Subject: Re: Re Ink jet ink linearization and limiting
  • From: Terry Wyse <email@hidden>
  • Date: Thu, 27 Jan 2005 17:37:11 -0500

Personally, I haven't found "gray-balanced" linearization to be any better than several other methods such as chroma, L*, density and dot area. Some are better than others but I don't believe a gray-balanced lin to be inherently better.

Now, if somebody would like to step up and sponsor such an experiment, I'd be perfectly willing to carry it out! I've got the spreadsheets and calculations ready to go.

:-)

Regards,
Terry

On Jan 26, 2005, at 8:26 AM, Roger Breton wrote:

Patrick,

Gray balance is the holy grail of color management.

Do you have evidence that NOT gray balancing a device through linearization
prior to profiling systematically results in non-neutral grays (grays with a
cast)? Or, put another way, is there evidence that the color science of
Gretag, X-Rite, Fuji, Heidelberg and other profile making software in the
industry to come up with an effective gray axis is 'constrained' by the
relative unbalanced (gray) state of a device to be profiled?


In other words, if equal combinations of CMY don't measure a* and b* values
very close to zero, no profiling package will ever be able to correct that,
by design? Or there will potentially be some error when calculating a gray
axis?


Yes, I've heard that a 'good profile' will be able to handle a
non-neutral linerization/ink limit. However, I have found that a
profile can only go so far in correcting this problem. I have developed
a habit of visually neutralizing at the linerization/ink limit stage
before I continue on to creating a profile. Please bear with me as I
explain. If we consider how many colors the human eye can see (let's
just say there are several million for now) and if we consider how many
color patches an ICC profiling package reads (the maximum in Monaco is
2989 patches) then you can understand that there is a huge amount of
'interpolation' between what the profiling software reads and what the
human eye can see. In other words, from and extremely limited number of
colors, the profiling package must 'guess' exactly how millions of
colors will be created. The only way a profiling package can do this
with any degree of accuracy is if it is fed data from a 'linerized'
printer - or a printer than can print fairly close to neutral through
linerization and ink limiting. I know I will be 'pinged' on this
assertion, so I'll hold further explanation for the future.

Regards,

Roger Breton  |  Laval, Canada  |  email@hidden
http://pages.infinit.net/graxx


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WyseConsul
Color Management Consulting
email@hidden
704.843.0858
http://www.colormanagementgroup.com
http://www.wyseconsul.com (coming soon)


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