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: Marco Ugolini <email@hidden>
- Date: Thu, 30 Oct 2008 17:30:41 -0700
- Thread-topic: G7 press calibration, best press conditions or average?
In a message dated 10/30/08 4:57 PM, Paul Foerts wrote:
> Steve,
>
> Well... (sorry for the tone, I couldn't resist):
> A conventional offset printing press cannot be "calibrated". Presses are
> "adjusted" by press operators.
> Without "adjusting" operators, there is no "definable" printing condition
> possible.
>
> You may use the G7 "methodology" to aim at an ISO standard printing
> condition. This methodology however cannot make a new press from an old one.
> You can compensate for TVI but you cannot eliminate process variations.
>
> Press maintenance is a basic part of process control.
> Press manufacturers have advanced tools for evaluating the accuracy of their
> presses. GATF has vernier tools available for DIY analysis.
> If the deviations in color to color register surpass a certain limit, you
> (the press of course) need "maintenance".
>
> When it is no longer possible to aim at your standard printing condition you
> need to find the cause for this failure. Why would you use the G7
> methodology for this?
>
> The presses should always be kept in their best printing state. The standard
> printing condition may be "average". This way all presses may be able to
> satisfy.
> I suppose this is what the press room meant.
Alright, Paul.
I believe you when you say that *you* cannot calibrate a press -- but others
are doing it. So, go figure.
See, they're not quibbling over the correct vocabulary: they're actually
*doing it*.
Perhaps you should remind them promptly how profoundly incorrect they are to
think that they are actually achieving the results that they can see in
front of their mendacious eyeballs.
Best.
Marco Ugolini
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