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 23:23:29 +0100
On Mon, 03 Nov 2008 12:27:25 -0500, Steve Miller <email@hidden>
wrote:
> 1: to ascertain the caliber of (as a thermometer tube)
> 2: to determine, rectify, or mark the graduations of (as a thermometer tube)
> 3: to standardize (as a measuring instrument) by determining the deviation
> from a standard so as to ascertain the proper correction factors
> 4: to adjust precisely for a particular function
> 5: to measure precisely ; especially : to measure against a standard
> â cal·i·bra·tor \-ËbrÄ-tÉr\ noun
>
> Isn't that what we are doing when we use the G7 method? #4 fits well. "To
> adjust precisely for a particular function."
> The press is adjusted, the plates are adjusted etc.. several items are
> adjusted.
>
> Is it that you don't like the word calibrate or you don't like G7
> methodology?
>>>
>>> Nothing gets "calibrated". If others like to call adjustment or
>>> setting
>>> "calibration", well, so be it. I suppose they'll agree to call all
>>> operators
>>> "calibrators" too. :-))
>>>
>>> Paul
Hi Steve,
Actually #1, #2, #3, #5 point to scales and instruments and this is what
calibration is all about.
Once calibration is performed, the instrument's output should be/stay in
agreement with the standard/reference.
The linearization of the platesetter could be called calibration as this is
the reference setting for the platesetter.
Adding compensation curves (G7) is what it is: tone value
compensation/adjustment.
I'm not aware of things which can be calibrated at a press.
(except for the press densitometer of course :-))
If we start using the word calibration for every action we perform, it will
loose its strength.
The G7 methodology may help you to aim at an ISO printing condition but it
may also ruin your control patch references. A 50% patch may no longer be a
50% patch...
If the images are printing OK, no problem. If something is wrong, the search
may get daunting! (presses with different curves -> mixed-up plates...)
Paul
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