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Re: File Preparation for 4 color Grayscale offset printing




On Nov 5, 2007, at 6:59 PM, Martin Orpen wrote:

ny suggestions on the best way to prepare a PS Tiff grayscale file
for 4 color offset printing? Proofs look neutral when we convert to
GRACoL2006_Coated1v2.icc and then print to our Kodak Approval (which
converts using a device link). With some vendors the final is fine,
with some there's a slight cast we'd like to avoid. Since the press
varies depending on the client, I'm looking for a "universal" way.
Advice would be greatly appreciated.



They'll always look OK when you proof them because the proofer because it's showing perfect printing conditions. But using a standard profile will mean that you images get hosed every time the printer loses control of gray balance - which is most of the time :-)

You'll find quite a few double page spreads in glossy magazines that
have one page sepia and the other looking like a cyan/black duotone.
They indicate the clients who think that having a profile and a copy
of Acrobat replaces the repro guy in the production chain...

You need to create (or find) a profile specifically for 4 colour black
and white images which is based on the same characterisation data but
produces a nice long and wide K and very little CMY - making it much
harder for the printers to hose.

In addition to Martin's suggestion above, another tactic I often use is to bias the separation slightly in a certain direction, e.g. a warm tone for portraits. The press will oscillate no matter what you do. I rather have it oscillate around a preferred color and not around 'neutral'.

Dick Busher
Cosgrove Editions
7042 20th Place NE
Seattle WA  98115

206-524-6726
888-507-7375
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