RE: Smarter RIPS
RE: Smarter RIPS
- Subject: RE: Smarter RIPS
- From: "Mark Rice" <email@hidden>
- Date: Thu, 7 Feb 2008 15:24:28 -0500
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.
Mark
From: email@hidden [mailto:email@hidden]
Sent: Thursday, February 07, 2008 3:05 PM
To: email@hidden; email@hidden
Cc: email@hidden
Subject: Re: Smarter RIPS
In a message dated 2/7/08 1:24:45 PM, email@hidden writes:
The present system, used by most RIP makers, is kind
of silly - print a test pattern and "look" at it to see when the ink bleeds.
There are a lot of points that can be chosen using this system, and its not
very scientific or repeatable. It seems like the ink limitation choice is a
critical first step that is done in very cavalier fashion.
Given that channel ink limit (as well as total ink limit, and assorted
cross-channel limits) may be determined by bleed, mottling, bronzing,
saturation max, D-max, or other factors such as strange little hooks or
reversals, the need to actually have a knowledgable individual look at the
results, as well as the numbers, to determine optimal values is not so
unreasonable... writing the algorithm to determine this automatically would
be a challenge.
C. David Tobie
WW Product Technology Manager
Digital Imaging & Home Theater
Datacolor
email@hidden
www.datacolor.com/Spyder3
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