Re: Supplied RGB - SWOP is not TR001
Re: Supplied RGB - SWOP is not TR001
- Subject: Re: Supplied RGB - SWOP is not TR001
- From: Roger Breton <email@hidden>
- Date: Thu, 27 May 2004 12:09:12 -0400
Rich,
I beg to disagree with your position on SWOP and TR-001. Please review
the last paragraph at the bottom on page 40 in SWOP Ninth Edition :
"Data characterizing the nominal center point of the population of
Certified Press Proofs can be found in ANSI/CGATS TR 001". How many
interpretations of that sentence could there be?
Roger Breton
On 27-May-04, at 10:17 AM, Rich Apollo wrote:
On May 26, 2004, at 6:18 PM, email@hidden
wrote:
Although there is supposed to be a SWOP standard - I see no
evidence of that in the reproduced pages. Colors and tonalities vary
wildly
SWOP is not necessarily TR001. SWOP is a description of a printing
condition based on dot gain, solid ink density, line screen, paper,
print contrast, etc. It is not a colorimetric characterization of that
printing condition. There are many variables that can be altered while
still keeping you within SWOP conformance.
All these prints you refer to - were they on the same paper? Did they
use the same ink, blankets, coating? Heck, for that matter, were the
presses running at the same speed? Were the chillers set to the same
temperatures? Were the trap numbers the same? Was the web tension the
same? Was there an expicit arrangement between the printers involved
that they would conform to a colorimetric standard? Which one? To what
tolerances? Were the separations generated in the same manner? Did
each printer use the same UCR/GCR/black generation settings? Did the
printed pieces match the proofs that were available press-side? Did
the printers all use the same screening technology? Were the
signatures laid out the same at each location?
Point is any or all of those printers may have been within SWOP
conformance.
Rich Apollo
Priority Litho
314-344-1144
email@hidden
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