Process control in a G7 world
Process control in a G7 world
- Subject: Process control in a G7 world
- From: Roger Breton <email@hidden>
- Date: Tue, 06 Mar 2007 23:57:45 -0500
Suppose printer X successfully completed an initial G7 press run. Having
outputted linear plates, ran the P2P23xn target at the nominal solid ink
densities and calculated required plate compensations to reach the
prescribed K and NPDC curves, printer X is now ready to turn jobs
commercially using the method.
One small element seems to be missing from the picture, however ; what to do
with process control.
Figuring out what to do with the black is straightforward and is achieved
with a good old densitometer. But figuring out what to do with CMY proves to
be a challenge. Really. Having adopted the nominal a* and b* defaults of 0
and -2 for Gray Tone Aims, printer X now wonders how to instruct its
pressmen to control gray balance on press the way they used to do it, very
successfully, with simultaneous measurements on the red, green and blue
StatusT filters? Nothing in the G7 documentation seems to covers this part
of the G7 method.
Will printer X have to buy 528s for all its presses, all of a sudden?
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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