Re: Smarter RIPS
Re: Smarter RIPS
- Subject: Re: Smarter RIPS
- From: Terence Wyse <email@hidden>
- Date: Thu, 7 Feb 2008 16:13:46 -0500
Hi Mark,
I can really appreciate what you're trying to do here as I've been
down part of this road myself. Some questions for you to ponder:
* Do you think *gray balance* is the holy grail of linearization
techniques? I did some experiments a couple of years ago showing that
it was no better than other techniques. Based on what I know *today*,
I think a "delta e" or L*a*b*-based linearization are as good as
anything, at least as good as a strict neutral gray lin.
* Why include UCR/GCR in the mix? Why not simply get to a C-M-Y
neutral gray linearization and add the K later, via profiling? I think
it would be a lot of work to develop a linearization routine that
would also include K generation.
* As far choosing ink limit and such, I agree that RIPs that have you
evaluate bleeding points, densities and the like is a bit crude. I'm
pretty satisfied that looking at things colorimetrically, via L*,
chroma, hue angle etc. is a much better technique. What I'd like to
see is an ink limiting technique or even a linerization technique that
was based on secondaries instead of just looking at primaries.
Secondary colors are arguably more important in photographic terms
than primary colors.
Just some thoughts,
Terry Wyse
On Feb 7, 2008, at 3:24 PM, Mark Rice wrote:
Hi David - I don't mind looking at it for the artifacts that you
mentioned,
but I have observed that different "eyeballs" or users will choose
any of up
to 10 points that appear to have similar densities and no bleeding,
but
actually have different measurable values. This is where the
inaccuracies
start. I would rather view the image, choose a "bleading point", and
then
have the computer show me a graph of density, and calculate some aim
point
targets for all four colors based on a choice of UCR, GCR, etc. THEN
we
should calculate the linearization.
_____________________________
WyseConsul
Color Management Consulting
G7 Certified Expert
email@hidden
704.843.0858
http://www.wyseconsul.com
http://www.colormanagementgroup.com
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