Re: Newsprint G7 calibration (and IFRA profile)
Re: Newsprint G7 calibration (and IFRA profile)
- Subject: Re: Newsprint G7 calibration (and IFRA profile)
- From: Henk Gianotten <email@hidden>
- Date: Sun, 25 Mar 2007 22:16:31 +0200
At 17:16 24-3-2007 -0400, you wrote:
Another wow for this link. Nothing to do with the G7 approach but look at
the clarity of this header:
> ECI2002
> ORIGINATOR "Ifra. www.ifra.com"
> DESCRIPTOR "Ifra26L"
> CREATED "30.06.2004"
> INSTRUMENTATION "GRETAGMACBETH SpectroScan. D50. 2 degree. geometry
45/0.
> no polarisation filter. white backing"
> PRINT_CONDITIONS "Newspaper Coldset-Offset printing according to ISO/DIS
> 12647-3:2004. standard newsprint. screen ruling 40 l/cm ± 2 l/cm"
> NUMBER_OF_FIELDS 11
The instrumentation is clearly labeled. Anyone can tell exactly how were the
measurements arrived at.
What a stark contrast with the SWOP 11 dataset:
(snip)
Here, what instrument was used to measure the data? No one can tell. I guess
there's more than water separating our two continents -- sadly.
Roger,
It's very interesting to read that you are using the IFRA26 info.
Perhaps Klaus did not know that for a Canadian application the IFRA30 info
could be more applicable.
However.....
A few weeks ago IFRA presented some statistical information on the usage of
the IFRA newspaper profiles.
Manfred Werfel, Research Director of IFRA was one of the experts at the
European Experts Meeting of
The International Standards for Print Production.
That meeting was organized by the International Federation of Printers
Associations (Intergraf) in Amsterdam.
The invited experts (60 from 12 different countries) covered several print
production standards
and ISO 12547-3 (newspaper coldset printing) was one of the subjects.
As you most probably do not know the US and Canada insisted on a
modification of the newspaper TVI.
The major countries decided to have an identical dot gain of 26%. The
North-Americans however wanted 30%.
That's why there is also an IFRA30 profile available.
Several printers in the US and Canada did printing tests to find out what
the real TVI's in production is.
The result: the average TVI for CMY and K is 25.9% (measured in 51 North
American plants).
The minimal TVI for CMYK was 9.4% and the maximum dot gain 40.7%.
So one could argue why using the 30% dot gain profile.
If you are interested I can send you the PDF of the presentation covering
the results of standardization
in the international newspaper industry.
Regards,
Henk Gianotten
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