Re: AM/FM screens
Re: AM/FM screens
- Subject: Re: AM/FM screens
- From: Niall Coady <email@hidden>
- Date: Tue, 17 Jun 2008 16:00:58 +0100
- Thread-topic: AM/FM screens
Hi Dan,
I don't think you could have confused things any more than they already
were!
I think it is fair to say, in general, UK and Euro printers are not as well
informed about NPDC as our Amercian counterparts (Funny me saying that I am
sure (-:)
What does seem to be the common factor here is that we cannot rely on
standard (Gracol - ECI ISO Coated v2) separations when printing with FM
screening, no matter what method you use (TVI process control or Neutral
Print Density Curve). Wonder how we fix that? (-:
I do like the way you cleared the air on this one (-: Great catching up at
Drupa.
All the best
Niall Coady
Targetcolour Ltd
Global House, 1 Ashley Avenue
Epsom, Surrey
KT18 5AD
United Kingdom
T 01372 822830
F 0870 751 8577
M 07740 940459
W Http://www.targetcolour.com
SKYPE: ncoady
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On 16/06/2008 21:26, "Dan Wilson.com" <email@hidden> wrote:
>
> Hi List/Lee,
>
> I don't know which G7 people you have been talking to, but the Solid Ink
> Density G7 targets is the same as that which you target in a TVI
> calibration.
>
> I cannot think of any reason to change from target density if you are
> producing an ISO quality product.
>
> Maybe you need to look over the "G7 How To" from www.gracol.org again to
> update and really understand the process.
>
> Using FM plates exposed on the same calibration curve used to expose AM
> plates will not work. Simply reducing the density would not achieve anything
> near a desirable result using either TVI or NPDC (Near Neutral Print Density
> Curve). It would probably be solid from 60% up.
>
> You need to have one calibration set for AM and a different calibration set
> for FM printing.
>
> Google up 'John Lind' and 'GATF'. Some years ago John did an excellent
> research project on web presses running conventional and stochastic
> screening. He documents reduced in usage, the $ gains and explains the
> reasons.
>
> Another handy explanation of stochastic and ink usage that I like can be
> found at:
>
> http://www.bsink.com/tech/StochasticScreening.pdf
>
> Hope this helps clear some confusion - or am I just adding a sort of
> stochastic "edge interference" to the discussion.
>
> Regards,
>
>
> Dan Wilson
> Managing Director
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