GCR and ink savings (was Re: Colorsync-users Digest, Vol 5, Issue 209)
GCR and ink savings (was Re: Colorsync-users Digest, Vol 5, Issue 209)
- Subject: GCR and ink savings (was Re: Colorsync-users Digest, Vol 5, Issue 209)
- From: Terence Wyse <email@hidden>
- Date: Mon, 16 Jun 2008 08:43:43 -0400
On Jun 15, 2008, at 3:09 PM, Brian Lawler wrote:
Regarding Roger's comments...
Why would switching from AM to FM result in an ink savings?
It does Brian but I've no good explanation for it.
I can think of one possible explanation for it in the case of the
device link profiles I've created for pressrooms. In the device links
I've created for AM screening, I will generally not start the K below
about 15-25% to avoid "peppering" or K dots in lighter colors but with
FM screening I've started K as low as 5% with no ill effect. The
result is more GCR and ink savings as a result of the longer K.
You're putting down the same dot area, and that would result in
approximately the same amount of ink being put on the paper.
The only thing that changes is the formation of the tonal
information: a clump of machine spots vs. a pseudo-random
distribution of the same machine spots.
If you were to calculate the area of paper covered by ink per cell
in an AM halftone and compare that the area covered by ink per cell
with an FM screen, they should be the same, or very close, otherwise
the image would be different.
I am eager to hear the explanation.
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!
BTW, regarding your earlier post that basically stated that GCR
doesn't save ink, you bet it does! I conservatively tell customers
that they will save between 10-15% by using device links when making
plates but the reality is it's closer to 25-35% in a lot of cases.
Again, I've got testimonials from customers that did some careful
testing.
Regards,
Terry Wyse
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