Hi, we are testing out an Epson 9800 right now and were having some
issues.
The red (100%y 100%m) Doesnt get red enough. To low intensity. And
the Delta E value landing on 9! All other colors are good. Im been
searching the net but havent found anything about this.
Im using GMG Colorproof and Fogra39 values.
Any ideas whats wrong?
This might be th wrong forum to ask about this but I'll give it a go
anyway.
//
_________________________
Magnus Sandström
Alfa Print
Cirkusgränd 2
172 63 Sundbyberg
08-546 007 74
It seems that there is some confusion about the certification for ISO
12647-2 (and other parts).
There are a number of independent organizations offering certification
for this ISO. In Europe these are VDM(Germany), FOGRA (Germany),
UGRA(Switzerland), SCGM(Netherlands and Belgium), and maybe some more.
All these offer their certification services also outside their local
country. All these organizations use in a large extent the same
procedure for auditing and have agreed to exchange auditing experience
in a yearly meeting of experts. All use accredited auditors and
certified or accredited local implementation consultants, partly these
are from the own organization, partly these are for practical reasons
(e.g. local language) from other organizations.
I cannot talk about the formal status of the others but SCGM is the
Dutch national board for certification in the graphic media industry and
accredited by the Dutch National Accreditation Board. So there is no
need for any accreditation by FOGRA or whatsoever organization, as this
board it the highest accreditation board available. I assume that also
FOGRA and UGRA are accredited by respectively the German and Swiss
national accreditation boards.
Each country has by international agreement to have a national
accreditation board, this board assures the correctness of the followed
procedures, the conformance with the content and the intent of the
standard, makes sure that the auditors are suitable for their job, have
sufficient knowledge about the subject (for that SCGM uses auditors from
IGT Testing Systems and VIGC), the measuring equipment is properly
maintained and calibrated etc. As backup for each specific certification
process, this board also maintains an Expert Group of different
stakeholders. These meet every 6 months to evaluate the results of the
audits during that period and makes recommendations to the national
mirror committee of the corresponding ISO (or other organization) for
improvement of the standard.
Wilco de Groot
IGT Testing Systems
P.O.box 12688
1100 AR Amsterdam
Keienbergweg 25-59
1101 EX Amsterdam
Thre Netherlands
www.igt.nl
T: +31.20.4099300
F: +31.20.6974842
E: degroot(a)igt.nl
IGT Testing Systems Amsterdam
Web: www.igt.nl Email: info(a)igt.nl
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At 15:41 12-11-2007 +0100, Lars Jacobsen wrote:
>By reading this PDF I now understand that even if you do your
>linearization curve like this a gradient may still have flaws that
>can only be detected by a visual check of a two dimensional gradient
>patch like the one on the Fogra chart. What is ment by a four color
>check plot ? Is it s print including the curve? Can you put these in
>other words?
>We have Agfa Digiwedges on every plate including a Star, but they are
>very small.
>Maybe I should get the Fogra chart.
>Lars.
Hi Lars,
Those small wedges are great to check the plates during production.
However, to control the jumps as described by Fogra, you
need more sophisticated materials.
I hope that you already applied the Altone Test Suite.
On the prints you already can detect the tone jumps.
In the Visual file 4 large round patches are used to check this.
If you don't have the Altona yet, you can download the visual file
free of charge.
Several printers suggest their customers to download this file
to check the basic quality of their proofing systems.
This is one of the reasons to make just this Visual file free
of charge. The other files, Measure and Technic, plus the digital
and analog information is not free of charge but can be purchased
via the www.altonetestsuite.com web site.
The Fogra digital Plate test file has a lot of additional test patches to
check your workflow.
I would invest in both Altona and the Fogra Test for your CTP.
The Four Colour check plot is a graph with the measurements
of all four tonal curves. The long halftone wedges are used
to measure that condition.
One can see the shape of the individual
curves and the relation between the 4 different shapes.
If they bump at the same point, it seems a CTP problem.
If they bump only in one colour, you have (most probably) a
press problem.
The round control patches can be used to check the influence
of the print and plate direction.
Lots of success,
Henk
Hello, does anyone know of a method to determine if an ICC profile has
already been applied to an image? We'd like to avoid applying the same
profile twice to an image that is untagged. We've thought about
analyzing the gamut or individual channel response. Any other ideas?
Sincerely,
Dwight Kelly
Apago, Inc.
"Ian Reid" <ian.r(a)bodoni.co.uk> wrote:
> If you use a program like Alwan CMYK Optimiser along with Gradual's Switch
> software you can apply the right ICC profile, add Metadata to the file
> automatically and then test if that has been applied as it goes through the
> workflow.
>
That would assume that I knew what profile has been originally applied
or applied it in my workflow. My question was for 'unknown' input files.
--
Dwight Kelly
Apago, Inc. 4080 McGinnis Ferry Rd Suite 601 Alpharetta, GA 30005
voice:(770) 619-1884 fax:(770) 619-1885
email: dkelly(a)apago.com web: http://www.apago.com
Hello all
I am trying to match our sheet-fed press to ISO 12647-2 as close as
possible.
The best Lab numbers I can get for primary colors are (white backing):
Cyan: 58,1 -34,7 -50,1
Magenta: 49,1 75 -2,9
Yellow: 89,3 -3,5 92,8
Black: 17,4 0,8 0,6
Numbers are close to ISO, but I would like to be closer. Specially Cyan
and Yellow could be closer, but for that it looks like I have to change
ink manufacturer.
Q: Should I try to get closer or it's just a waste of time
(hair-splitting)?
Please, I need your opinion!
BTW we make color proofs with ISOcoated_v2_efi.icc, and actually I'm
trying to get my press closer to proof. But that's same as ISO.
Thank you for your time!
regards,
Juris
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Content preview: Hi All, I am following the discussion about the Lab values
an how close you should get to the ISO values. I agree with Erik. It is not
about getting as close as possible to the ISO values but to find an inklayer
thickness (if you want you can express this in density after yo found the
correct lab values for your situation)which allows you to print also within
the ISO tolerances for TVI. The lab values you can reach are ery depending
on the ink you are using. Even ISO 2846 inks are showing differences in lab
values you can ahieve on the press. I myself work in Asia and we just recently
certified 4 companies according ISO 12647. They were using different inks
with different Lab values on the press, but all within the ISO tolerances.
ISO is indeed more than only running on coses possible Lab values. [...]
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I will be out of the office starting 11/07/2007 and will not return until
11/26/2007.
I will be out of the office starting 11/08/2007 and will return 11/26/2007.
I will respond to your message when I return.
If you have an immediate need please contact Peter Hwang at 973-882-2053
any update on the lists of certified iso printing companies? also, lists of certified ISO consultants and auditors?
thanks...
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