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: Tue, 04 Nov 2008 03:15:20 -0800
- Thread-topic: G7 press calibration, best press conditions or average?
In a message dated 11/3/08 4:25 AM, Mark Stegman wrote:
> This is the point of averaging profiles: to get a more 'realistic' picture of
> the capabilities of a press through the print run.
At which point is an "averaged" profile so generic as to become practically
meaningless? I don't see much that is "more realistic" in that.
It appears to me more important to apply stringent process controls rather
than let the results float within a broadly-defined "average". If a print
provider commits to creating usable profiles, they must also commit to
higher standards of quality/process controls and stability.
A profile that only describes a random "point in time" in a press' behavior,
in the absence of a commitment to maintain that press' behavior consistent
and stable as well as to make it precisely known, is effectively useless, or
close to useless.
> An averaged profile will, by necessity, exhibit a colour space that
> is 'compromised' yet more readily achievable ON AVERAGE.
How wide is the "average"? 3, 5, 8, 12, 18 DeltaE 2000?
With errors on press higher than 6 DeltaE, what is the point of using a
profile at all -- any profile? Then it's back to the old ways of "editing on
press". Effective ICC color management doesn't have much of a role within
such a scenario.
> This means that, when the designers and prepress use it to predict the
> result during soft and/or hard proofing they will see something that is
> achievable and realistic, not idealistic.
No, they will still have no reliable preview of what the final results are
going to be. Without a commitment on the printer's part to stick to precise
quality and process controls and to ensure a minimum of press stability
across the run, no "averaged" profile will offer a satisfactory preview of
the actual results.
> In other words, an accurate prediction of the end result.
An accurate preview of a widely varying press condition is an impossibility.
> To those that think this is demeaning the role of the press operator as a
> 'button pusher'...
...I would reply that it takes all of an operator's / team's skills and
abilities to bring a press up to a chosen known standard of performance (G7
conditions, for example) and keep it there within strict tolerances.
No fear of any "button pushing": that doesn't even come to mind.
Marco Ugolini
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