RE: G7 press calibration, best press conditions or average?
RE: G7 press calibration, best press conditions or average?
- Subject: RE: G7 press calibration, best press conditions or average?
- From: Roger Breton <email@hidden>
- Date: Mon, 03 Nov 2008 18:41:40 -0500
Paul,
> What gets profiled is a printing condition, not a press.
True.
> In fact what gets measured/characterized is your printed target.
Absolutely.
> With 4, 8, 16 or more targets on the same sheet, 4, 8, 16 or more
> "results" will be available.
Sadly. Except on 1:1 printing system like Heidelberg's Anicolor presses.
Beautiful. Have you seen one?
> 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...
Again, so sadly true. An astute press profiler will pick a particular,
surface, spot on the printing form and limit all its measurements/analysis
to this particular location. Otherwise, it's becomes unpredictable. You're
100% right.
> To make things even more complicated: the contents of the image on the
> plate influences the inking profile (ghosting).
Ah! Right again. Please have mercy :(
> The inking system tries to
> eliminate this effect but does not always succeed. (Hence the scrambled
> patches to average? the effect).
True.
> 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...
Right but what's more important? The fact that the number stays at some
divine value or that the whole thing is brought under some kind of tonal
control? We can't have our cake and eat it too, you know.
> Standard printing conditions are the basis for "happy printing".
> (no custom profiles needed - canned profiles freely available).
You'd be how many clients would just be happy with this baseline quality!
> Pointing to "Within the Stone" in this respect is saying that standard
> printing conditions are inferior.
No. I said here's proof that *any kind* of printing can be brought under
control and wonderful things *can* happen when printing is brought under
control.
> The makers of this book did choose an exceptional printing condition.
"Exceptional"? Just a plain, everyday press, with good coated paper and good
inks that they ran to higher density than usual, for that little extra.
> They
> used ICC tools for max gamut reproduction. They had to pay a lot for
> this.
Right. Through their teeth.
> (Maybe it would have been even more expensive using proprietary tools)
What do you have in mind?
> Paul
Roger
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