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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