Re: ISO 12647-7 "tolerances"
Re: ISO 12647-7 "tolerances"
- Subject: Re: ISO 12647-7 "tolerances"
- From: Mike Strickler <email@hidden>
- Date: Wed, 23 Apr 2008 14:12:45 -0700
Date: Tue, 22 Apr 2008 16:12:23 -0400
From: Kevin Muldoon <email@hidden>
Subject: ISO 12647-7 "tolerances"
To: email@hidden
Message-ID: <email@hidden>
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Look, a system can be optimized to a particular reference ... to
very low DeltaEs, but this is to some degree dependent on which
reference it is.
Some degree dependent? 100% degree dependent. Color management is all
about creating CMYK numbers to match a color reference.
You took that sentence out of its context. I was referring to paper
white. Thank you, I do know what color management is and have
invested rather heavily in it!
Paper is still an issue, and a numerically perfect proof may be
visually unacceptable to the customer.
A proof that doesn't match final press output (or vice-versa) is
unacceptable. A client who doesn't like a press-accurate proof is an
opportunity for more color corrections.
Here again you distorted my point.. The color can be colorimetrically
accurate but the client may dislike having extra dots laid down to
match paper color. This is an issue with inkjet systems, not halftone
systems--there are only so many choices of proofing paper, and what's
used is generally not precisely GRACoL #1, Swop 3, etc., and neither
are the press stocks This is a practical problem to be worked out
(with, yes, some compromises), not an occasion for blaming the
customer for not "liking color-accurate proofs."
A laminate proofer addresses this pretty well, but it won't give
the super-wow numbers you're floggong
A laminate proofer will most certainly reach 'super-wow' tight DeltaE
numbers. Laminate proofers such as the Kodak Approval have always had
a much wider gamut than the presses they were meant to emulate.
Gamut, as you know, is not a big problem for proofers now, at least
for process color.
As an
example, we have an XP4 running 03 media and a DVL for GRAoL and, as
verification, we measure the entire GRACoL IT8.7/3 and run each patch
reading through DeltaE program (dCIE1994) to see how far we are away
from target values. Our average Delta E for thousands of patches is
perhaps 1.2 and no one patch has strayed beyond a 3.5.
The REAL optimization problem is meeting as many of the customer's
needs as possible without failing on any one objective, keeping the
cost reasonable, and the training and maintenance issues within
practical limits.
That's VERY cool, and I should not have put all laminate proofers in
the same class; but there are a lot of laminate systems (and inkjet
systems) out there being used that aren't so good (no, I won't
mention names), and the specs take this into account. It is in the
end a set of compromises. Sure, you should do better if you can--
always! I was merely explaining some of the factors ISO considered.
I don't work for them, by the way.
If the proof doesn't closely match a standard (regardless of how easy
it is for the customer to operate the proofer) then it's not a proof.
If you are suggesting sacrificing tight color standards for ease of
use, cost, reliability and maintenance, then perhaps we're not
talking apples to apples. I feel that measuring success upon the
'happiness of the customer' as salesmen often do is quite often a
mistake. Ethics demands that the customer is given not only what he
wants but what he needs as well.
Of course, but nothing is absolute, and the same shoes don't fit
everybody. Ethics require that we give honest advice, but this advice
can't totally ignore what is practical for the needs and budget at
hand, or else it actually becomes less ethical. We get the client as
far along as possible under the circumstances--sometimes we have to
wait until the cash flow improves, for example, or the boss becomes a
believer. This calculation does not come out the same at all print
shops and design houses.
What I find most disagreeable is this charge that if someone
disagrees with a specific statement about standards he doesn't care
about standards at all, or merely panders to the lowest expectations
of customers. That would come as a surprise to my clients, whom I
sometimes must struggle with to spend MORE money and elevate their
standards. We're on the same team, Kevin, but our roles aren't
exactly the same.
Please contact me offline if you wish to continue this discussion.
Thanks,
Mike Strickler
MSP Graphic Services
423 Aaron St. Suite E
Cotati, CA 94931
707.664.1628
email@hidden
www.mspgraphics.com
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