Re: File Preparation for 4 color Grayscale offset printing
Re: File Preparation for 4 color Grayscale offset printing
- Subject: Re: File Preparation for 4 color Grayscale offset printing
- From: Richard Booth <email@hidden>
- Date: Thu, 08 Nov 2007 11:28:08 -0500
- Thread-topic: File Preparation for 4 color Grayscale offset printing
The labor intensive manual labor in our workflow is eliminated by using a PS
Action which creates the CMYK
file by doing all of the channel duplication and loading of curves saved for
the CMY ranges. All you need to start
with is the the corrected greyscale file. Going from a greyscale to a
properly set up 4/c grey CMYK with the Action takes
3 seconds. I¹ve used the Quadtone workflow, as well. As with anything
related to image manipulation and perhaps how many correction cycles you may
be dealing with, it¹s all a matter of how you like to work.
In a message dated 11/8/07, Michael Eddington wrote:
IMO, there are still some things that ICC color management doesn't do quite
well enough (or at least intuitively), and nice 4/c black separations is one
of them. In the case of 4-color "grayscales", we usually generate a quadtone
from a gray scale image with CMYK builds similar to what Richard Booth
suggested...keeping the gray balance percentages as defined by Gracol and
introducing CMY when black reaches 30% or so, maxing at 260TAC.
The benefit here over what I'm interpretting from Richard suggestion (which
is requiring a bit of manual channel manipulation of each image?) is that
once you define your quadtone curves and save the settings, all you have to
do is optimize your grayscale images for highlight/shadow, then load you
quadtone settings via Image-Mode-Duotone. One catch is that the quadtone
build is specific for the grayscale profile you use, so if you deal with
grayscale images tagged with various grayscale profiles, you'll have to
convert them all to the grayscale profile you used when generating the
quadtone curves...converting to common grayscale "working space" if you wil,
prior to applying your settings. We've had very nice results on some
high-end books with this method. This isn't really ICC "color management" so
you'd want to hang on to the original grayscales for repurposing for say a
lower TAC.
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