Re: Colorsync-users Digest, Vol 4, Issue 395 (Out of the Office Monday 11/5)
Re: Colorsync-users Digest, Vol 4, Issue 395 (Out of the Office Monday 11/5)
- Subject: Re: Colorsync-users Digest, Vol 4, Issue 395 (Out of the Office Monday 11/5)
- From: "Jeffrey Reed" <email@hidden>
- Date: Mon, 05 Nov 2007 15:10:32 -0500
If you have an immediate photo reformatting need, please contact Steve
Puglia at 301.837.3706, or if you need an event photographer please
contact Earl McDonald at 202.357.5957.
>>> colorsync-users 11/05/07 15:05 >>>
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Today's Topics:
1. Re: Colorsync-users Digest, Vol 4, Issue 394
(email@hidden)
2. Re: Accuracy of instruments (Graeme Gill)
3. Subject: Re: Color Bars on Inkjet Proofs (Richard Booth)
4. Re: Subject: Re: Color Bars on Inkjet Proofs (Terry Wyse)
5. File Preparation for 4 color Grayscale offset printing
(Vanita Cyril)
6. Re: File Preparation for 4 color Grayscale offset printing
(Karsten Schwarze)
7. Re: File Preparation for 4 color Grayscale offset printing
(Martin Orpen)
----------------------------------------------------------------------
Message: 1
Date: 5 Nov 2007 07:03:28 +1100
From: email@hidden
Subject: Re: Colorsync-users Digest, Vol 4, Issue 394
To: email@hidden
Message-ID: <email@hidden>
Content-Type: text/plain; charset="UTF-8"
Image Science is currenty shut on a short break.
We'll be re-opening on the 7th of November (ie Wednesday).
Your message has been received and we'll respond to it then.
Cheers
Jeremy Daalder
------------------------------
Message: 2
Date: Mon, 05 Nov 2007 13:10:27 +1100
From: Graeme Gill <email@hidden>
Subject: Re: Accuracy of instruments
To: ColorSync <email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Terry Wyse wrote:
> is all that good. I've done a few informal comparisons between my
> SpectroEye, EyeOne and iSis and suffice it to say that I'm NOT
impressed
> with their inter-instrument agreement.
You should try the same using display colorimeters. Oh boy, are there
some large variations. 5 delta E and much more seems not unusual for
some colors and displays.
Graeme Gill.
------------------------------
Message: 3
Date: Mon, 05 Nov 2007 10:35:02 -0500
From: Richard Booth <email@hidden>
Subject: Subject: Re: Color Bars on Inkjet Proofs
To: <email@hidden>
Message-ID: <C354A256.3071%email@hidden>
Content-Type: text/plain; charset="US-ASCII"
When you say this:
> We have to acknowledge that
> some proofing may strive to achieve exacting colorimetry on the proof,
like
> ISO-12647-x or SWOP2006_Cx or GRACoL_x. In those instances, the
measurement
> of the control strip will tell the initiated user what is the degree
of
> conformance of the proof to the standard or specification in question.
> Roger Breton
does it mean there is inkjet colorimetric data that is related to these
standards for the multitude of inkjet and substrate combinations. To put
it
another way, is there GRACoL_x conforming data for the Epson 4800 or say
the
Canon IPF5000 on, let's say, an EFI proofing paper that could be pulled
from
the patches on a control strip that would confirm compliance with the
GRACoL_x standard for that particular printing device? Yes I know the
RIP
manufacturers have been selling the SWOP branded Seal of Approval for
awhile. But if you're a printer and you get a proof from your publisher
or
ad agency client with this SWOP or Gracol branded combination of device,
ink
and paper, can you actually tell it is what it says it is from reading
patches? If the data exists for the the various combinations, where does
one
find it.
>
>
>
>
> ------------------------------
>
> _______________________________________________
> Colorsync-users mailing list
> email@hidden
> http://lists.apple.com/mailman/listinfo/colorsync-users
>
> End of Colorsync-users Digest, Vol 4, Issue 393
> ***********************************************
------------------------------
Message: 4
Date: Mon, 5 Nov 2007 10:50:12 -0500
From: Terry Wyse <email@hidden>
Subject: Re: Subject: Re: Color Bars on Inkjet Proofs
To: ColorSync User List List <email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
You can pull this data directly from the (free) GRACoL2006_Coated1,
SWOP2006_Coated3/Coated5 data sets. Most standard proof verification
color bars will, or should, use a subset of patched teken directly
from the chracterization data, in this case formatted for an IT8.7/4.
If you are using a non-standard set of color bars, you can also pretty
accurately derive this data from profiles made from the
characterization data sets above.
In theory, ANY printer/media combination would "qualify" as long as
the colorimetric data on the color bar matches that of the
characterization data within a specified tolerance.
You can find everything you need at either the GRACoL (www.gracol.org)
or SWOP (www.swop.org) web sites. Probably very soon you'll see a
standard set of color bars (ISO 12647-7) published with reference data
provided for both GRACoL and SWOP data sets. It's in "beta" use as we
speak.
Regards,
Terry Wyse
On Nov 5, 2007, at 10:35 AM, Richard Booth wrote:
> When you say this:
>> We have to acknowledge that
>> some proofing may strive to achieve exacting colorimetry on the
>> proof, like
>> ISO-12647-x or SWOP2006_Cx or GRACoL_x. In those instances, the
>> measurement
>> of the control strip will tell the initiated user what is the
>> degree of
>> conformance of the proof to the standard or specification in
>> question.
>> Roger Breton
> does it mean there is inkjet colorimetric data that is related to
> these
> standards for the multitude of inkjet and substrate combinations. To
> put it
> another way, is there GRACoL_x conforming data for the Epson 4800 or
> say the
> Canon IPF5000 on, let's say, an EFI proofing paper that could be
> pulled from
> the patches on a control strip that would confirm compliance with the
> GRACoL_x standard for that particular printing device? Yes I know
> the RIP
> manufacturers have been selling the SWOP branded Seal of Approval for
> awhile. But if you're a printer and you get a proof from your
> publisher or
> ad agency client with this SWOP or Gracol branded combination of
> device, ink
> and paper, can you actually tell it is what it says it is from reading
> patches? If the data exists for the the various combinations, where
> does one
> find it.
_____________________________
WyseConsul
Color Management Consulting
G7 Certified Expert
email@hidden
704.843.0858
http://www.wyseconsul.com
http://www.colormanagementgroup.com
------------------------------
Message: 5
Date: Mon, 5 Nov 2007 13:35:29 -0500
From: Vanita Cyril <email@hidden>
Subject: File Preparation for 4 color Grayscale offset printing
To: "email@hidden Mailing List"
<email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset="us-ascii"
Hi all,
Any suggestions on the best way to prepare a PS Tiff grayscale file
for 4 color offset printing? Proofs look neutral when we convert to
GRACoL2006_Coated1v2.icc and then print to our Kodak Approval (which
converts using a device link). With some vendors the final is fine,
with some there's a slight cast we'd like to avoid. Since the press
varies depending on the client, I'm looking for a "universal" way.
Advice would be greatly appreciated.
Thanks
Vanita
Vanita Cyril
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23 east fourth street
new york, ny 10003
+1 212 353-3330 tel
+1 212 353-0367 fax
www.shootdigital.com
------------------------------
Message: 6
Date: Mon, 05 Nov 2007 19:47:30 +0100
From: Karsten Schwarze <email@hidden>
Subject: Re: File Preparation for 4 color Grayscale offset printing
To: Vanita Cyril <email@hidden>, ColorSync Mailing List
<email@hidden>
Message-ID: <C35523D2.8927%email@hidden>
Content-Type: text/plain; charset="US-ASCII"
Hi Vanita,
You can find a Gracol2006 based profile under
http://www.colormanagement.org/download_files/GRACoL2006_Coated1_GCR_bas.zip
It has a strong GCR and a TAC of 300% with black at 98%. This should
serve
your needs.
Regards,
Karsten.
Am 05.11.2007 19:35 Uhr schrieb "Vanita Cyril" unter
<email@hidden>:
> Hi all,
> Any suggestions on the best way to prepare a PS Tiff grayscale file
> for 4 color offset printing? Proofs look neutral when we convert to
> GRACoL2006_Coated1v2.icc and then print to our Kodak Approval (which
> converts using a device link). With some vendors the final is fine,
> with some there's a slight cast we'd like to avoid. Since the press
> varies depending on the client, I'm looking for a "universal" way.
> Advice would be greatly appreciated.
> Thanks
> Vanita
>
>
>
>
> Vanita Cyril
> ....................................
>
>
> 23 east fourth street
> new york, ny 10003
> +1 212 353-3330 tel
> +1 212 353-0367 fax
> www.shootdigital.com
>
>
> _______________________________________________
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>
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------------------------------
Message: 7
Date: Mon, 5 Nov 2007 18:59:02 +0000
From: Martin Orpen <email@hidden>
Subject: Re: File Preparation for 4 color Grayscale offset printing
To: email@hidden
Message-ID: <email@hidden>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
On 5 Nov 2007, at 18:35, Vanita Cyril wrote:
> ny suggestions on the best way to prepare a PS Tiff grayscale file
> for 4 color offset printing? Proofs look neutral when we convert to
> GRACoL2006_Coated1v2.icc and then print to our Kodak Approval (which
> converts using a device link). With some vendors the final is fine,
> with some there's a slight cast we'd like to avoid. Since the press
> varies depending on the client, I'm looking for a "universal" way.
> Advice would be greatly appreciated.
They'll always look OK when you proof them because the proofer because
it's showing perfect printing conditions.
But using a standard profile will mean that you images get hosed every
time the printer loses control of gray balance - which is most of the
time :-)
You'll find quite a few double page spreads in glossy magazines that
have one page sepia and the other looking like a cyan/black duotone.
They indicate the clients who think that having a profile and a copy
of Acrobat replaces the repro guy in the production chain...
You need to create (or find) a profile specifically for 4 colour black
and white images which is based on the same characterisation data but
produces a nice long and wide K and very little CMY - making it much
harder for the printers to hose.
--
Martin Orpen
Idea Digital Imaging Ltd
------------------------------
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