Re: U.S. Web Coated (SWOP) v2 always produces blues that shift?
Re: U.S. Web Coated (SWOP) v2 always produces blues that shift?
- Subject: Re: U.S. Web Coated (SWOP) v2 always produces blues that shift?
- From: Kevin Muldoon <email@hidden>
- Date: Thu, 28 Jun 2007 16:08:57 -0400
Hi Andrew,
In regards to blue rendering, I see differences between SWOPv2 and
SWOP06 and I prefer SWOPv2 on a purely subjective level. I tend to
see SWOP2006 going more red/purple than SWOPv2 (though the expert
says 'less') and I'm not sure if we could even place a binary 'right/
wrong' on this kind of shift. I'd say this is not an unusual or
unexpected color shift for a SWOP press because SWOP presses do not
hold color-metric standards.
As far as a TR001 proofing device is concerned I'm afraid this animal
never existed and probably never will. Even the more modest SWOP
Proofing Certification is hardly a gauge of the behavior of a press.
In fact, blue-to-purple shifts are a notorious problem with SWOPv2
separations sent to PolaProofs, Analog Matchprints & XP Approvals and
I could only see SWOP06 exaggerating this known issue.
However, we should not consider this a fault of SWOPv2 or even
SWOP06, but rather a flaw (perhaps unavoidable) in the implementation
of expensive proofing devices.
Perhaps you can convince some SWOP press to piggy back a few
swatches? I'd love to see the results myself.
--
Kevin Muldoon, Owner
TrueBlueDot - Fine Art Printing
New Haven, CT 06511
email@hidden
www.truebluedot.com
"Our pigment meets your imagination"
On Jun 28, 2007, at 3:03 PM, email@hidden
wrote:
Message: 1
Date: Wed, 27 Jun 2007 14:31:44 -0600
From: Andrew Rodney <email@hidden>
Subject: U.S. Web Coated (SWOP) v2 always produces blues that shift?
To: "email@hidden"
<email@hidden>
Message-ID: <C2A82550.3FCF4%email@hidden>
Content-Type: text/plain; charset="ISO-8859-1"
Here's one quote from an industry expert who believes that the TR001
specification as reflected in the U.S. Web Coated (SWOP) v2 profile
built by
Thomas Knoll in Photoshop always produces a blue shift. I was
hoping some
here with experience with this process could comment. The profile he¹s
supposedly comparing is one that is based on G7 spec:
I took a quick look at this profile and I agree that with respect
to blues,
cool neutrals, and black generation, it's considerably better than
SWOP v2. I
didn't check anything else. However, being based on machine
measurements and
an
inaccurate colormatching formula, it *does* have the typical
purple shift,
though nothing as bad as SWOP v2. However, it's something to
watch, a minor,
manageable problem.
It does, however, reemphasize how far off base the SWOP v2 profile
is with
respect to blues. The two are farther apart than can be explained
by any
normal
press conditions--and I think most people would agree that the
Coated3 profile
is itself too purple in the blue range, persons who worship
spectrophotemeters excepted.
This doesn¹t jive with my experiences although I¹m sure others have
much
more experience in using this profile.
Comments?
Ideally I¹d like to put this to a test using something a bit more
reliable
and empirical than simply looking at CMYK numbers from a file that
someone
separated. Anyone have a proofing device or press that conforms to
TR001
that would be willing to run a test?
Andrew Rodney
http://www.digitaldog.net/
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