Re: A new RIP?/Aurelon Info
Re: A new RIP?/Aurelon Info
- Subject: Re: A new RIP?/Aurelon Info
- From: Marco Ugolini <email@hidden>
- Date: Tue, 23 Mar 2004 17:10:39 -0800
In a message dated 3/22/04 at 1:29 PM, C David Tobie writes:
>
ICC based systems make convenient assumptions like D50, that simplify the
>
process, while at the same time limiting it (a certain degree of the
>
simplification is simply the limiting). Spectral systems can calculate
>
metamerism and other items beyond the capabilities of ICC based systems that
>
only use color values like Lab. But the complexity tends to outstrip the value
>
for most print based work, and the non-standardized nature of such spectral
>
solutions make them difficult to use in many workflows.
David,
Please forgive me if I sound somewhat didactic, but allow me to reiterate
that while ICC-based RIPs and color management indeed do "limit" their
parameters through assumptions about light sources, etc., on the other hand
standardization is absolutely necessary if one wishes to replicate results
in locations that are geographically separate from each other, which is the
whole purpose of color management at least for prepress.
Without "simplifying" somewhat, that is, assuming a specific light source of
known temperature and spectral quality along with a specified type of output
for a given image, it would seem futile to compare results, since the
conditions of producing a hard copy of an image and viewing it would be
unknown. How useful is a system that refuses to state its parameters and to
"simplify" (i.e., define) its boundaries?
So, given that they are non-standardized, like you say, i.e.,
non-repeateable because too broadly defined, how can spectral solutions be
of any practical use in everyday production work?
On the other hand, since, as you state, spectral solutions are better at
accounting for metamerism, I wonder how that valuable feature could be
incorporated into ICC-based color management systems, since both pigment-
and dye-based inks are still somewhat metameric, even after some recent
remarkable improvements. Is that feasible? Are there ways to to take that
predictive element of spectral solutions and make it a workable part of
ICC-based solutions? What is in the future of ICC technologies to expand
their scope and utility in this important regard?
--------------
Marco Ugolini
Mill Valley, CA
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