re: input characterization
re: input characterization
- Subject: re: input characterization
- From: "Greg Remington" <email@hidden>
- Date: Mon, 25 Nov 2002 09:46:47 +0100
On Sat, 23 Nov 2002 05:37:45 -0600, Dennis W. Manasco wrote;
>
At 4:34 pm -0800 11/21/02, John Gnaegy wrote:
>
>
>You won't be able to tell exactly what objective color a thing is
>
>...
>
>If I take a picture at sunset, I want that nice yellow of the
>
>sunset, I don't want it made objectively correct so it looks like a
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>setting sun at noon.
>
...
>
IMHO characterization of the input is the most import part of any
>
system. If the input is inaccurate, then any extrapolation based on
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it is not only inaccurate but has an inaccuracy that is compounded by
>
the transformations of the extrapolation (e.g. changes from RGB to
>
Lab to CMYK will amplify the inaccuracies at each step).
>
>
Repeatable, consistent, characterization of input devices is the only
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way to produce accurate output. Can this be done? I don't know.
>
Should it be attempted? Certainly.
Well said Dennis, this aspect of color management has not received
it's due amount of attention in the past. Past posts to the affect
that photographic systems do not 'theoretically' require motive
dependent characterization are in my opinion, and in practice, just
plain false.
Objective colors in real images are dependent on the specific lighting
used during image capture. The only way to begin to characterize these
systems is to measure known colors in the same lighting and to create
a profile from this data. During the profile creation process, it is
possible to include information from the image to allow the photographer
to decide whether color accuracy of the target fields, or some other
photographic aspect of the image, should be given preference.
We (YxyMaster GmbH) have been actively involved in the development
and the use of available color workflow tools for years. Because
these tools are expensive and nearly impossible for normal photographers
to understand and use properly, we have developed our own solutions.
We are confident that we can 'produce accurate output using repeatable
and consistent characterization of input devices'. In the process, we
also hope to begin to address other real problems of photographers, only
one of which is the 'correct' characterization of the sunset scene
described by John.
Their are practical and physical limitations to what is possible
without reverting to subjective changes that are not based on color
science and theory, but we believe that our products represent a
truly revolutionary step in the right direction...
Photographers must also be aware of what types of images can be
theoretically characterized - the fact is that some color related
problems (e.g. mixed lighting) can not be accurately solved using
any current technology. These problems are not really related to
digital devices and have always existed. In all probability,
photographers will have to continue, as in the past, to make
informed compromises in such situations. Even in these cases,
digital technology may help, even if it can not 'solve' the
problem.
For a short description of our products, download the following
PDF;
http://www.calibr8.com/web/calibr8-neu.pdf
We hope to officially release Calibr8 IP for the Macintosh on
Dec 20.
A DEMO Version of Calibr8 IP (both for Macintosh and PC) will be
available soon thereafter. Email us at email@hidden for more
information.
The above PDF does not include a description of new features that
should address issues that go far beyond traditional input
characterization and that will begin to solve color workflow problems
of working photographers without resorting to magic. It is our goal to
provide professional color workflow tools that everybody can afford
and use with confidence.
We are looking forward to the expected response (both positive and
otherwise) of color professionals and potential competitors, but most
of all, from the photographers that will be using the products.
Greg Remington
YxyMaster GmbH
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