Re: ISO12647-7 question
Re: ISO12647-7 question
- Subject: Re: ISO12647-7 question
- From: email@hidden
- Date: Wed, 06 Feb 2008 09:57:00 +1100
Belinda,
G'day! Your enquiry has initiated a discussion amongst the members of the ISO TC 130 in
Australia of which I am a member. I forwarded your query to them which elicited a flurry of
exchanges and some valuable advice.
The following contribution is from Yves Roussange, a FOGRA certified ISO colour management
proficionado:
Hi Everybody,
Some guide line to the topic:
1. Are the measurements to be done across the sheet, or down as
well, ie is it nine across only, or three by three?
3x3 (see under www.fogra.org | services | certifications | download |
proof evaluation -> and see documentation how we do it)
2. are the three sets of CMYK values to have nine measurements each
(so you end up with 27 measurements) of is it three measurements for
each set of values?
Yes, for the system certification you need 27 measurements.
I'm guessing that what is required is three separate pages each
covered in one of the defined tint values, each of which is then
measured nine times in a 3x3 manner, but I just want to check.
see under www.fogra.org | services | certifications | download |
homogeneity and download the test files
Have a nice week-end,
Yves
I downloaded the FOGRA documents (test files) and the only point I would add is that the
certification process is a 'testing' process which not only looks at colour tolerance but uniformity
across the sheet (as required by the standard). This means that, during the testing/certification
process the whole sheet is used to establish compliance to the standard as opposed to the normal
production mode where copy takes up the real estate and a relatively small control strip is used
for print/proof verifcation (just like we always did... or should have done).
For the truly anal this might create some angst because of the different modes of depositing ink
on substrate however. the precision of todays proofing equipment seem to leave all the room for
error to the user and/or the appliaction(s) that confront them. (Some of the more expert propeller
heads on this forum might like to debate the validity of the control strip method and the possibility
for variation outside the stated tolerances in the standard across the sheet during production.)
FOGRAS' files are an example of a set of tools developed to test for compliance to the standard
and require THIER certification to be used in a production environment. They reflect an
interpretation of the practical application of the standard. In other words, their way of testing it.
Remember, they are in the BUSINESS of certification which requires (thier) independent
monitoring of the production process and its output OVER TIME. As Yves said, see the website for
details.
I will send you the rest of the exchange off-line.
Mark Stegman
Teacher
Graphic Prepress
Sydney institue
TAFE NSW
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