Re: Presses and G7
Re: Presses and G7
- Subject: Re: Presses and G7
- From: Dan Wilson <email@hidden>
- Date: Mon, 03 Nov 2008 15:50:07 +0000
- Thread-topic: Presses and G7
Hi Roger,
Yes there are laboratory tests to check for ink conformance, or you can ask
your ink vendor if the inks comply to ISO 2846.
For me the best way to check the ink is to use SpotOn! software. You can see
the delta E from the ISO standard for primaries and secondaries.
I really like to use SpotOn! at the start of a G7 calibration run to fine
tune the SIDs of c.m,y to optimize the rgb overprint delta Es as close as
possible to the standard. A very strong starting point for any type of
calibration.
It is a nice visual tool and easy to use.
If your inks don't show up well in this test, talk to your ink manufacturer
- you will be able to give him the optimum lab* readings you achieved verses
the 12647-2 Standard to help them solve the problem.
Vested interest alert: I am a SpotOn! Dealer.
As far as the bigger issues in this thread about press condition, well,
better condition is "better" than average or less than average. The most
important thing is consistency which generally means you want your press
closer to the 'serviced state' rather than poorly maintained and
inconsistent. An inconsistent press will give you heart-burn to the max (I
know from personal experience).
I did a G7 calibration at a printer here in Dublin about 16 months ago. 2 x
B1 five colour presses and one B2 five colour press. They run 24 hours, 7
days.
This printer has not re-printed a job in 16 months due to a missed customer
expectation of the press and proof matching.
Best regards,
Dan Wilson
--
G7 Certified Expert
UGRA Certified Expert/Consultant
--
Prepress I.T. Limited
Dublin, Ireland
Dublin +353 (0)85768 2733
www.prepress-it.com
>
> ------------------------------
>
> Message: 2
> Date: Sun, 02 Nov 2008 21:17:59 -0500
> From: Roger Schutte <email@hidden>
> Subject: Re: Presses and G7
> To: <email@hidden>
> Message-ID: <C533C987.A184%email@hidden>
> Content-Type: text/plain; charset="US-ASCII"
>
>> Another equally important factor, one that is seldom mentioned, is the
>> quality and consistency of ink.
>>
>> If inks are purchased and used without testing for color consistency
>> and acceptability, then the G7 gray balance will break, and the
>> process will go out of control.
>>
> Brian,
> How does a printer test for color consistency and acceptability of their
> supplied inks?
>
> Regards,
> Roger Schutte
> J.S.McCarthy Printers
> Augusta, Maine
> ------------------------------
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