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: Graeme Gill <email@hidden>
- Date: Fri, 07 Nov 2008 19:45:34 +1100
Paul Foerts wrote:
The eyeballs are used for comparing color and more.
Human vision is the most important element in the evaluation of the printing
process.
I have always found human vision to be the most unreliable of
ways of evaluating color in many situations, a characteristic
common to all the human senses. Our senses are all too easily influence
by moods and expectations (aka biases, and responsible for things like
the placebo effect), and some of the worst possible "instruments"
for doing absolute "measurement". It is very well know and
accepted for instance that human vision tends to adapt to the perceived
white of scene, not something that one would expect of a reliable
instrument. While human senses can be very good at comparative judgement,
at times exceeding the sensitivity of instruments in this task,
they are still subject to the bias of expectations, something
that can only be guarded against by using elaborate procedures
such as double blind testing. So the reality is that eyeballs and
instruments need to work together in achieving good color reproduction,
checking each other, used where they have strength, and compensating
for each others weaknesses.
For creating a repeatable and tight tolerance process though, I certainly
wouldn't rely on eyeballs - they are subject to the frailties of their
owners, and simply aren't consistent enough to be relied on as a reference.
Graeme Gill.
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