Re: Newsprint G7 calibration
Re: Newsprint G7 calibration
- Subject: Re: Newsprint G7 calibration
- From: Roger Breton <email@hidden>
- Date: Sat, 24 Mar 2007 17:16:27 -0400
>> Wow, call me shortsighted or uneducated but that is one show stopper.
>
> I won't. But I don't think it's a show stopper. Take a look at
> http://www.color.org/IFRA26L.txt, Patch 729: Lab 40.39/0.09/0.37
>
> Klaus
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:
> IT8.7/4
> # Sample data listed in column order of the IT8.7/4 default visual layout
> LGOROWLENGTH 33
> ORIGINATOR IDEAlliance
> FILE_DESCRIPTOR "SWOP2006_Coated5, Copyright 2006 IDEAlliance "
> CREATED 8/3/2006 # Time: 20:57
> PRINT_CONDITIONS "SWOP Grade 5 coated paper, ISO 2846-1 inks"
> "# Characterization conforming to SWOP, tuned to the G7 Neutral Print Density
> Curve"
> MEASUREMENT_GEOMETRY "0/45 Spectrophotometry, No Filter, White Backing"
> WEIGHTING_FUNCTION "D50, 2 degree per CGATS.5"
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 Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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