Re: RE: New SNAP Standard (GCR instead of UCR)
Re: RE: New SNAP Standard (GCR instead of UCR)
- Subject: Re: RE: New SNAP Standard (GCR instead of UCR)
- From: "eric@poem" <email@hidden>
- Date: Sat, 22 Aug 2009 21:22:32 +0100
No pointer to the ISO Newspaper26 v4 ICC profile, which is very
popular for
newsprint separation, according to IFRA.
Assuming newspaper conditions are similar, this profile works very
well in my experience. The caveat, as has been mentioned on this list
before, in order to get the correct TAC value of 240%, RGB to CMYK
conversions must be executed using perceptual intent with Black Point
Compensation switched off. Otherwise you get a lower value around 212%.
In passing, I have found that in this age of digital photography, when
processing images for newspapers it is always advisable to open up the
shadow range. All digital photography, with the possible exception of
still life studio, has a tendency to close the shadows down. The
detail is there in the file, and can be seen in the histogram, but is
compressed and giving it a little room to breath does wonders for the
printed result.
GCR was a particular passion of mine and I was evangelical about it in
the mid 80's, even giving a few talks to the GCA conferences about it,
courtesy of a certain Ms Agi Rossos, of the press chemistry fame. We
had the first digital solution that enabled us to scan in PCR, as it
was termed then by the Hell company, on our DC350's, (great scanners).
The look up tables were loaded into the cabinet on 8 inch floppy discs!
Truthfully they weren't that good back then, but the concept of
replacing redundant colour with a computed black equivalent was
compelling, but perhaps a little before it's time... I am particularly
gratified, and a even a little smug, remembering the resistance, that
GCR is a vital component in standardised printing, and for those that
go further than the levels in the standard profiles, in optimised
printing. The fact that it is possible to greatly reduce ink levels
and still retain colour fidelity and accuracy with modern colour
science is stunning– but the press crews must be aware of the change
of importance when switching from a UCR style skeleton black, to a
full range GCR separation. A traditional black tends to be used and
abused, and the black unit might well be the Cinderella of the press,
but with full GCR it is the Belle of the Ball!
regards
Eric
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