RE: Colorsync-users Digest, a blue shift
RE: Colorsync-users Digest, a blue shift
- Subject: RE: Colorsync-users Digest, a blue shift
- From: "Tintera, Charles V" <email@hidden>
- Date: Tue, 3 Jul 2007 07:48:45 -0400
- Thread-topic: Colorsync-users Digest, a blue shift
Andrew Rodney said:
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/
I have seen this blue shift numerous times (and the "orange" reds sometimes) and we work in RGB not CMYK. I suspect that it is a "feature" built into Photoshop (:-()!
One of my last corrections to any image is magenta/blue. Most customers don't seem to object to it. Either they don't see it, or they ignore it, or they accept it as "right" (whatever that is:-)). I thought it was just me!
cvt
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