Re: Total Ink Limit (TAC)
Re: Total Ink Limit (TAC)
- Subject: Re: Total Ink Limit (TAC)
- From: Todd Shirley <email@hidden>
- Date: Sat, 10 May 2008 11:55:58 -0400
On May 10, 2008, at 5:28 AM, Dan Wilson wrote:
In an ICC transformation does the Total Ink Limit (TAC) get changed?
Usually it does. The TAC is defined when a profile is made. In
programs like ProfileMaker Pro and Monaco Profiler, the user can type
in whatever TAC they want, regardless of where the source data is
from. So it would be possible to take characterization data from a
newspaper print run and make a profile out of it with a TAC of 400,
but obviously that would only be useful for proofing, not for actually
preparing an image for newsprint. The easiest way to find out the TAC
of a profile is convert and RGB patch of 0,0,0 to the profile. In some
profiles, different rendering intents can have different TACs, so you
might want to check them all. Or if you have a program like ColorThink
Pro, it can tell you the TAC for all rendering intents.
I understand the file has not changed and will need to be adjusted
later
(maybe with a device link) to be suitable for the newspaper press.
Am I understanding this correctly?
When I prepare images for Newsprint, I find I get the best results
using the perceptual rendering intent. Normally, for offset or web
work, I prefer relative colorimetric, but since the newsprint gamut is
so vastly compressed compared to RGB or "full-ink" CMYK, colorimetric
transforms tend to push most colors to the boundaries of the gamut and
make a heavy, muddy mess. Perhaps a device-link could help you from
here, but I have had great success with perceptual rendering; it both
reduces the ink and produces a relatively pleasing result. Of course
there is often further tweaking that has to be done in Photoshop, but
not nearly as much work as trying to fix a colorimetric transform.
Download the SNAP profile ( http://www.color.org/registry/SNAP_2007.xalter
), and convert your image using perceptual rendering. The resulting
file will have a TAC of 240 and look pretty good in most newspapers.
-Todd Shirley
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