Re: press or proofer
Re: press or proofer
- Subject: Re: press or proofer
- From: Peter Kleinheider <email@hidden>
- Date: Wed, 19 May 2004 17:29:43 +0200
Hi all
I can only answer for the european market, but here it would look like
this:
1) check that the printer is working according to ISO 12647-2. There
are specifications for
- the color specimens for the color inks (all as Lab)
-) the dotgain
-) the tolerances
-) the paper standards these values apply to
this implies, that the printer has setup the CTP system acordingly.
2) if a printer can print according to these specifications, it is
possible to use the ISO-profiles available, that where taken from a
standardized printrun. At the moment 6 different profiles (combination
of paperclass and printing technique) are available
So if someone is working according to this standard, it is possible to
use these profiles for proofing purposes and for separation.
If someone needs different ink limits or black generation, it is
possible to get the characterization data for free.
These characterization data got produced with tools for flattening and
dotgain adoption of multible sheets, that where first checked if they
are within the ISO tolerance.
With these characterisation and tools like PrintOpen 5 from Heidelberg
we now also have the possibility to generate profiles for similar
printing conditions that are close to the ISO standard without the need
of real prints. These profiles are in my experience very often better
than some our old profiles we have generated from real prints, since we
only measured about 10 sheets and had not the tools to "harmonize" the
measured values.
This brings me to the following conclusion:
If a printer is printing according the standard, it is possible to use
the standard profiles for separation and proofing. Only in the worst
case that e.g. the print uses the maximum + tolerance and the proof is
at the maximum - tolerance, you will see a huge difference between a
proof and the according print.
My question is now: since ISO is an international standard, does it
also get used in the US?
Peter
Am 19.05.2004 um 15:44 schrieb Jim Rich:
Simon,
Without knowing all the details of your relationship to the printer
it is
hard to give specific advice.
Here is question and comments to consider about this undertaking.
Is the CTP portion of the printing process proven to be optimized?
That is, did some one (like a vendor or consultant) come in to the
printer
(or did the printer themselves) and optimize the CTP process by
figuring
out the dot gain of the CTP and press and then run some tests on the
press
to find out the optimum densities to run to. And then did the press
get
setup with good process controls so that the printer can get
consistent
color results.
This might be a set of tough questions to ask the printer and tougher
for
them to answer. However, if the printer does have the answers then you
have
a good shot at it.
Once you know that type of press information you would then run some
more
tests to verify that the pre-press files you are sending them will
work as
expected. You will then stand a chance at getting a good press
profile.
My.02.
Jim Rich
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