Re: Re Ink jet ink linearization and limiting
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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