G7 press calibration, best press conditions or average?
G7 press calibration, best press conditions or average?
- Subject: G7 press calibration, best press conditions or average?
- From: Paul Foerts <email@hidden>
- Date: Mon, 03 Nov 2008 22:12:29 +0100
On Mon, 03 Nov 2008 09:10:11 -0500 Roger Breton <email@hidden>
wrote:
snipped
>> aslo have an impact. It is
>> unrealistic then to expect a single profile of the printing press to
>> tell you much about what might come
>> off the production line. When it comes to making a profile of a
>> printing press the first question that
>> should be asked is "What will the profile be used for?"
> True. It's ludicrous to believe that one press profile will capture the
> essence of the press behavior in its many moods and temper but that's what
> we have to hold it against, nevertheless.
snipped
What gets profiled is a printing condition, not a press.
In fact what gets measured/characterized is your printed target.
With 4, 8, 16 or more targets on the same sheet, 4, 8, 16 or more "results"
will be available.
A conventional offset press can be set for uncountable (= more than a lot)
printing conditions.
I use the metaphor "a printing press is a profile editor" as you can
generate any amount of different conditions (settings) wich may result in as
many profiles...
To make things even more complicated: the contents of the image on the plate
influences the inking profile (ghosting). The inking system tries to
eliminate this effect but does not always succeed. (Hence the scrambled
patches to average? the effect).
To make things frightening complicated: when printers manipulate their plate
curves (using the G7 method), the tone values on the control patches need a
compensation value too... a 50 % reference may no longer be a 50 %
reference...
Standard printing conditions are the basis for "happy printing".
(no custom profiles needed - canned profiles freely available).
Pointing to "Within the Stone" in this respect is saying that standard
printing conditions are inferior.
The makers of this book did choose an exceptional printing condition. They
used ICC tools for max gamut reproduction. They had to pay a lot for this.
(Maybe it would have been even more expensive using proprietary tools)
Paul
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