Re: TIL on press
Re: TIL on press
- Subject: Re: TIL on press
- From: Busher Jr Richard C <email@hidden>
- Date: Tue, 12 Sep 2006 08:41:32 -0700
Date: Mon, 11 Sep 2006 21:26:34 -0400
From: Roger Breton <email@hidden>
Subject: Re: TIL on press
How can I determine TIL on a press?
Appreciate any feedback.
Faro
Two deciding factors come to mind : a) drying time and b) shadow
detail.
Other factors are paper quality, press capability, press operator
capabilities.
I often print with 380% TIL on premium/#1 coated sheets. That 380%
refers to the maximum black in a photographic image or illustration. I
also create "rich" black backgrounds with up to 347% (92.80.75.100
cmyk).
In addition, with a few top printers, I can push the ink densities on
press. I have often printed with wet ink densities of k = 230, c & m =
1.80, y = 1.30. The screening is Stochastic, usually 10 microns. This
requires modified plate curves to account for additional dot gain in
the 3/4 tones.
Both higher TIL and ink densities require skilled and motivated press
operators because the ink/water balance is more critical and the powder
adjustment is also more critical. However the results can be stunning
if done correctly.
On some presses, too much ink causes production delays because the
sheet
remains wet for prolonged periods. So ink drying must be taken into
consideration when deciding TIL.
True. Using an aqueous coating to seal the sheet will speed up turn
around time. However I have found the aqueous coating sometimes does
not work with heavy rich black backgrounds.
If ink drying is not a problem then I look at the point of diminishing
returns. By measuring increasing TIL targets (280%, 300%, 320% ...)
it's
possible to tell where further addition of ink is not worth.
This being said, I use 320% for sheetfed offset and 300% for web
offset.
For projects where I am not doing all of the prepress, or where I am
not involved in the press check I stick with numbers similar to Roger's
numbers above.
Keep in mind, too, that 350% TIL is not a disaster per se, as long as
it's
not use all over the sheet.
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
Dick Busher
Cosgrove Editions
email@hidden
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