Re: Re: G7 press calibration, best press conditions or average?
Re: Re: G7 press calibration, best press conditions or average?
- Subject: Re: Re: G7 press calibration, best press conditions or average?
- From: "eric@poem" <email@hidden>
- Date: Wed, 5 Nov 2008 12:03:41 +0000
My point is that whether it's called calibration or adjustment the aim
is to bring the machine into a state of conformity.
As Paul says, presses can be set for any number of printing
conditions, for that I would read "printing colourspaces." In reality
this is often a dance round a mulberry bush trying to match a proof.
And as Marco says, unless you understand the variables you are dealing
with, how can you create the colourspace that is effectively
"assigned" to the colour numbers supplied to make the reproduction
match the intention? This is more like the enlightened approach that
is taken by companies when the penny has dropped.
We have been guilty as an industry of suppling the press crews with
incorrect data; colour numbers not suitable for the target condition
and often with an incorrect and misleading "contract proof" as a
visual target. The content provided, the cmyk numbers, has always
driven the on the fly adjustment of the press, no matter how
inappropriate they were. This is the bad old days as far as I am
concerned, press crews chasing their tail, leading to the inevitable
mutual blame culture that has dogged our industry for years.
When press crews have had this explained and be shown that the way
forward is for them to set up their machine to match a set of
characterisation data, using specific spectral targets that are
independent of any subjective aimpoint, i.e a page proof, it is like a
veil has been lifted from their eyes: get the rugby ball, the gamut,
the right size and shape and all of the colours expected will be in
there somewhere.
Surely this is a calibration? The press crew now has a very specific
set of target data to match, the machine, the ink, the fount, the
blankets, etc etc, may well all have to be "adjusted" to achieve the
"calibration" that will result in a conforming colourspace being
created.
I have been involved with 55 consumer magazines here in the UK that
print by the numbers every issue, mostly without hard copy proofs.
This could not have been achieved unless there had been a major
seachange in attitude press-side. The press room overseers have a much
easier task today than ever before, by the time the press is up to
speed and in fit, they are saving good copy, because the colour
numbers supplied match the colourspace being run.
See it really is a piece of ****!
in a message dated 11/3/08 1:12 PM, Paul Foerts wrote:
A conventional offset press can be set for uncountable (= more than
a lot)
printing conditions.
And how are those attained, if not by calibrating the press/ink/paper
variables?
So far you may be winning the hairsplitting award, but you are not
making
much understandable sense.
On 4 Nov 2008, at 20:03, email@hidden wrote:
n a message dated 11/3/08 1:12 PM, Paul Foerts wrote:
A conventional offset press can be set for uncountable (= more than
a lot)
printing conditions.
And how are those attained, if not by calibrating the press/ink/paper
variables?
So far you may be winning the hairsplitting award, but you are not
making
much understandable sense.
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