Re: TIL on Press
Re: TIL on Press
- Subject: Re: TIL on Press
- From: Randy Zaucha <email@hidden>
- Date: Thu, 14 Sep 2006 08:40:58 -0700 (PDT)
TIL also determines the Dmax of your printed images
which controls the visual contrast of the print. The
blacker (denser to the eye) the possible Dmax in the
darkest shadows, the more contrast from white can be
achieved.
Having worked at press houses, the majority of people
who supplied images for print had no concept of this
important principle. While printing an image with 350%
TIL on an uncoated stock can cause drying and sheet
sticking problems, printing an image with 280% TIL on
a quality coated sheet sacrifices potential image
contrast by limiting Dmax. Scanner operators were
religious about TIL.
I have found many CMYK ICC profiles that are
acceptably accurate for color accuracy but deficient
for Total Ink Limit for the stock being printed on.
With Photoshop 4 and 5 I used to punch up the Dmax for
these images using the Black channel CMYK sliders in
the Selective Color Correction tool. A poor man's UCA
(under color addition) control.
A properly separated black channel is important too
but that is another story.
As mentioned previously, all printing devices can
reach a peak Dmax/TIL and adding more colorant after
that will not increase visual density. Knowing this
value optimizes your printing process.
Randy Zaucha
Kinkade Company
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