Re: determining optimum dot gain
Re: determining optimum dot gain
- Subject: Re: determining optimum dot gain
- From: Ray Maxwell <email@hidden>
- Date: Wed, 24 Nov 2004 00:02:34 -0800
Hi Mark,
A good place to start is to understand that the following should be true
in a closed system.
Press dot gain = proof dot gain = separation dot gain
This means if the separations are made for SWOP printing then the proof
should be set to this dot gain and the press should be adjusted to the
same dot gain.
You can separate for any dot gain. You can adjust a proof to any dot
gain. Your DI press can emulate any dot gain.
If you have a lot of legacy files or separations you should calibrate
everything to match them unless you want to re-separate all of them for
a new dot gain.
Ask yourself where your files orginate and what dot gain they have been
separated for?
I would also point out that many years ago I did a test that may be of
interest to this group on this subject. I plotted file Postscript
percentage vs. L* output on a press that had a dot gain of around 22%.
The plot was almost exactly linear. This mean that on a press with a
dot gain of about 22% a change in percent input in the file causes a
visually proportional change in appearance.
Ray
Mark wrote:
I've got a Quickmaster DI press at work and I'm want to adjust the dot
gain and I need some help.
I can basically set any dot gain I want by first linearizing the press
(plates are imaged directly on press) and then selecting a dot gain
curve in the RIP. There were some curves supplied with the press but I
wasn't too impressed with them. I've got a curve that's working ok at
the moment but it was just put together by looking at the little
sample graph and adjusting values to get the shape of the curve we
wanted.
Can anyone provide a more scientific way (without making my head
explode from too much color theory) for setting up an optimum dot gain
curve?
Thanks,
Mark
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