Re: GCR and ink savings (was Re: Colorsync-users Digest, Vol 5, Issue 209)
Re: GCR and ink savings (was Re: Colorsync-users Digest, Vol 5, Issue 209)
- Subject: Re: GCR and ink savings (was Re: Colorsync-users Digest, Vol 5, Issue 209)
- From: Henk Gianotten <email@hidden>
- Date: Mon, 16 Jun 2008 16:27:37 +0200
At 08:43 16-6-2008 -0400, Terence Wyse wrote:
I hear ya Brian but all I can tell is that it's true. I've got
testimonials from a couple of my customers that print both AM and FM
using "ink saving" device links in the pressroom and they've all told
me they save more ink using FM and device links.
The other FM "phenomena" is when doing a G7 press curves (no links,
just plate curves). You can hit the same G7 "NPDC" curve by the
numbers for both AM and FM but the two will still print completely
different, especially from highlight to midtone. So there's something
more going on with FM than meets the eye!
Hi Roger, Brian and Terence,
FM dots differ from AM dots in size and behavior.
Big AM dots tend to have a very uneven ink coverage. Some parts 1.1
gr/square meter ink and other parts 4.8 gr/square meter ink. The additional
ink thickness does not increase density or color saturation.
So that amount of ink is wasted. Small FM dots have a far less uneven ink
coverage so there is less ink wasted.
Compare it with the panting of a door by a professional painter. He needs 2
layers of high quality
paint and a good brush. He makes the right movements with just a small
overlap.
If I would have to paint the same type of door and have the same quality of
paint,
there are 2 major differences.
I use a lousy brush and make the wrong movements.
I paint the same door, use the same paint but have 2 layers of paint as a
minimum and 5 layers at some places. I would paint that door 5 times to get
(nearly) the same color.
The color is (more or less) identical. The total color impression (seen
from a large distance please!) is also identical. But the amount of paint I
(have to) use, due to my lack of skills, is far more.
Traditional AM screens (in traditional offset) have that problem too.
The brush differs and the movements.
This uneven ink distribution is also a problem with screen combinations for
spot colors.
That's one of the reasons FM screens can simulate PMS and Goe colors (or
any other spot color) better than traditional screens.
Kodak promotes the Spotless FM Staccato and the better ink behavior is part
of their success.
Any second generation FM will show a better color reproduction, I think.
Of course, FM is only possible if a substantial number of other quality
criteria will be met.
The same applies for the professional painter.
He costs more but saves paint and delivers a higher quality.
Difficult to admit, but that's the truth! :-)
Regards,
Henk
Sorry for using metric info in the comparison.
Your absolute values will differ, the relative values not.
Kodak (the former Creo division) has a great description of the ink
behavior and spot sizes.
Gordon Pritchard (a.o. print application specialist) had some great charts
to show.
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