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: Henry <email@hidden>
- Date: Thu, 6 Nov 2008 17:50:35 -0500
In a message dated 11/5/08 1:11 PM, Henry wrote:
Press crews have traditionally aimed at solid densities and gain
values at various parts of the tone scale. A fancy way of saying
this would be, "they set up the machine to match a set of
characterization data that are independent of any subjective aim
point". The press crew is thereby defining the gamut's size and shape.
G7 is just a different method. By either method, the press arrives.
If it arrives at the same place by either method, then which is better?
Marco replied:
The one that also (a) achieves stability and (b) maintains it with
the least
amount of effort.
My bet is that the colorimetric route (G7, as opposed to
densitometric-based
methods) is the better one.
_______________________
Marco, I just don't follow what your reply to my question. I have
read it several times and it sounds as if you didn't understand what
I wrote. The fact is that densitometry does achieve stability, with
arguably the same, and possibly less effort.
How does maintaining specific SIDs and specific TVIs NOT achieve
stability?
How is maintaining SIDs and TVIs more effort that G7 Lab measurements?
The bet that G7 is *better* than densitometric-based method is, um,
somewhat deceptively attractive. If we were to use real money, what
would the ground rules be?
Since I don't believe that we are ever going to agree on the rules
anyhow, I'll propose a simple one, such as:
1. The one and only rule: The press is to be in a repeatable state.
How is it that one could prove that G7 is better at bringing a press
to this state? This would only be a matter of quibbling over the
accuracy of Lab vs. density values. They are both accurate
measurements, are they not? And, since when does a press not move
about during a run? (I ask this in advance of the inevitable
disagreement over the acceptable range of the measurements).
Don't you suspect that a press operator can use a densitometer to
bring a press to its target in an acceptable manner?
Henry Davis
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