Re: Colorsync-users Digest, Vol 5, Issue 209 - AM/FM screens
Re: Colorsync-users Digest, Vol 5, Issue 209 - AM/FM screens
- Subject: Re: Colorsync-users Digest, Vol 5, Issue 209 - AM/FM screens
- From: Terence Wyse <email@hidden>
- Date: Mon, 16 Jun 2008 08:51:48 -0400
On Jun 16, 2008, at 4:38 AM, Lee Badham wrote:
FM screening has a higher dot gain than conventional screens. This
is because of there are many smaller dots, each which can spread
(more circumference), rather than a lesser number larger dots.
So what the printer is doing is closing the ink ducts and reducing
the solid ink density to reduce the dot gain back to the same as
that of the AM screened plates. That surely will also affect the
solid ink colours. Maybe because it won't affect the grey balance,
the G7 people think this is ok. The solid colours are not affected
by the screening technology used, because there is no screen.
It's not just about the dot gain difference. We're assuming here that
the plates have already been adjusted to achieve a similar tonality
(dot gain, TVI, G7 NPDC, whatever) for the same solid ink values. What
many of us have observed is that even AFTER compensating for the
different dot gain, there's a major difference in the way FM and AM
screening behave on press.
A good G7 Expert would NEVER simply reduce solid ink to maintain gray
balance and call it "good". He or she would (should) first and
foremost verify that they are hitting the correct ISO L*a*b* values
for the printing process being targeted and then observe the resulting
gray balance and "NPDC" and make the necessary corrections.
Regards,
Terry Wyse
_____________________________
WyseConsul
Color Management Consulting
G7 Certified Expert
email@hidden
704.843.0858
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