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
Hi,
Can someone explain to me why the characterization data and the ICC profile for PSRgravureLWC have different paper whites?
ICC profile c0m0y0k0 = L 90.28 a -0.60 b 2.62
PSRgravureLWC_ECI2002 c0moyoko = L 90.65 a -0.09 b 3.16
What should be the correct target value for spectrometer certification?
Thanks,
Michael van den Heerik
TJDR Cape Town
Od 24.09 do 25.09 jestem poza biurem.
W pilnych sprawach proszę o kontakt na komórkę
I will be out of the office from 24.09 to 25.09.
If you need assistance, please call me (+48) 697 701 788
Pozdrawiam/Best Regards
Joanna Chamera
Hi Nick,
I am not one of the selection of ECI experts but it seems that they all are
in Stuttgart for their important Media Producers Forum.
I am just one of the Dutch ECI list members.
I will try to answer your question and most probably you will
get more details of the 'real experts' after the weekend! :-)
The most important information for the speccing of printed material
is the "Output Condition". In some applications the system refers to
the "Output Condition Identifier". It links to the data needed to describe
the actual color gamut for a specific combination of process, paper and ink.
The Characterization Data is identical to the Output Condition.
The Characterization Data is based on a specific set of dot percentages
and dot gain or Tonal Value Increase for CMY and (most probably)
a higher one for K. There is no GCR and UCR in these prints.
The next level is the Output Intent or profile for that process-paper-ink
combination.
The GCR is part of this profile and important for the printing process.
Fogra created the Characterization Data such as Fogra 39.
ECI made a set of profiles such as ISOcoated_v2. They even made another
profile based on the same Fogra39 characterization data but with a lower
CMYK TAC. That profile is labeled ISOcoated_v2_300. That has just 300%.
The ECI profiles have a relatively high amount of GCR.
Adobe made also profiles based on the same Characterization Data fogra39
however with a different GCR setting. As you most probably know GCR
can have a length component (amount of UCR and length of K) and a width
component. That describes the amount of tertiair colors (CMY combinations
replaced by K. If all those "dirty" colors are replaced by K we have
maximum GCR. Until recently 50% GCR was the maximum.
The Media Standard Prints 2007 (www.bvdm.org) now describes a maximum
GCR setting of 70%.
Adobe and ECI build profiles based on identical Characterization Data but
Adobe has (in general) a lower GCR.
Some Americans prefer that. Some Europeans too.
Recent tests show that we easily can reduce the amount of GCR if
we have a good process control.
I would suggest to talk to you printer. Perhaps they already tested both
profiles side by side and know what they have to advise.
My personal experience is that we have good reasons to increase GCR.
It's good for the stability of the process and will improve the quality
(major reason). Of course one has less visual register problems, less ink
consumption and less drying problems. Printers like it.
Major conclusion: Recent Characterization Data is very important.
So Fogra39 is better than Fogra27.
Both ECI and Adobe made profiles based on the most actual CD (Fogra39)
Quality of the profiles and amounts of gray balance and GCR are the next
point to check.
I hope this info helps
At 11:13 11-9-2007 +0100, you wrote:
>Dear ECI,
>
>Looking for some advice, I have been using color management
>for our print production for some time now, in particular your
>ECI-RGB.icc / ISOcoated.icc profiles.
>However, now that you have released revised versions of both rgb and
>cmyk profiles, how does this compare to the Adobe profile shipped with
>their software ?, why should I use your profile over the Adobe profile ?
>What is the relationship between you and Adobe if any ?
>
>Appreciate any help you may be able to offer.
>--
>Regards, Nick
-----------------------------------------------------------------------------------
Henk Gianotten, Prins Hendriklaan 58 3761 DW Soest, Netherlands
Tel. +31 (0)35 60 12 206 Fax: +31 (0)84 73 04 497 e-mail: henk(a)gianotten.com
------------------------------------------------------------------------------------
I will be out of the office starting 25/09/2007 and will not return until 28/09/2007.
I will respond tyo your email on my return, or phone 0417 223 171
Od 24.09 do 25.09 jestem poza biurem.
W pilnych sprawach proszę o kontakt na komórkę
I will be out of the office from 24.09 to 25.09.
If you need assistance, please call me (+48) 697 701 788
Pozdrawiam/Best Regards
Joanna Chamera
ISOnewspaper26v4 has been good so far with color reproduction for our use, another profile we use for old presses would be zeitung.
-----Original message-----
From: "Miguel Medalha" miguelmedalha(a)sapo.pt
Date: Mon, 24 Sep 2007 06:15:41 +0000
To: eci-en(a)lists.callassoftware.com
Subject: [ECI-EN] ISOnewspaper26v4 profile and stochastic screening
> Hello all
>
> I need some advice from the list's members, if you're pleased.
>
> I work with a newspaper that is going to be printed on a web press, using
> CTP with stochastic screening.
>
> My question is: is the ISOnewspaper26v4 ICC profile adequate for stochastic
> screens? If not, what would be the recommended profile?
>
> Thank you very much.
> Miguel Medalha
>
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Hi Michael,
Thanks for your answer, this is very useful. I am trying to take some
densitometric values, although ISO 12647 is using the CIELAB colorspace I am
using densities as a starting point for the dry and wet densities ( to
account for the dryback).
Can you please precise what kind of differences we can expect from one
standard to another.
Thanks, Steeve.
On 14/9/07 11:00, "eci-en-request(a)lists.callassoftware.com"
<eci-en-request(a)lists.callassoftware.com> wrote:
> :
--
Steeve Roucaute
Reprographic Manager
Precision Printing Ltd
47 Thames road
Barking
Essex
IG11 0HQ
Tel: 0845 606 4001
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www.precisionprinting.com
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>>You mentioned particular status e, I and t, will anyone give specifics
>>what are the purpose and difference of all these preset standards? (7
>>different standards: DIN, DIN NB, ANSI A, ANSI E, ANSI I, ANSI T,
SPI.)
>>
Here's a quick reference to density filtration I found:
The mainly used responses are Status A, Status E and Status T.
Status T / ANSI T: wide band color reflection densitometer response,
used
mainly in United States
Status E / DIN: wide band color reflection densitometer response, used
mainly in Europe, main difference to Status T: higher values for yellow
Status A / ANSI A: wide band color reflection and transmission
densitometer
response, used mainly in the photographic industry (measurements of
prints
and slides)
Status M: wide band color transmission densitometer response, used in
the
photographic industry (measurements of negatives)
Status I / SPI, DIN NB: narrow band densitometer responses, rarely used
Status G: "traditional X-Rite graphic arts response", was used about ten
years ago mainly in USA in X-Rite's 400-Series, today only a
"compatiblity-feature" of newer X-Rite densitometers.
Incidentally, the built in densitometer of our new(ish) HP Indigo press
reports only Status G filtration...not sure why they chose that, but
seems odd.
Back to your original inquiry though, you state that you are " trying to
take some measurements with a Spectroeye", but you don't indicate if you
want to render colorimetric (CIELab values) or densitometry values. For
colorimetric, you would only need to worry about the illuminant and
observer angle as the density filtration will be moot.
_______________________________________
Michael Eddington | North American Color, Inc.
QA Manager | Gracol G7 Certified Expert
5960 S. Sprinkle Road | Portage, MI 49002
P. (269) 323-0552 | F. (269) 323-0190
meddington(a)nac-mi.com | www.nac-mi.com
