RE: Qualifying a CMYK Press Profile
RE: Qualifying a CMYK Press Profile
- Subject: RE: Qualifying a CMYK Press Profile
- From: "Darrian Young" <email@hidden>
- Date: Thu, 21 Nov 2002 17:13:40 +0100
Paul Lindstrom wrote:
>
Graeme, how do you calibrate a rip? Or do you mean calibrating the
>
proofer, with the help of modules in the rip software?
Graeme Gill wrote:
>
To use more precise nomenclature, the "proofing system" is composed
>
of two component, the proofing RIP and the proofing printer (not to
>
be confused with the Imagesetter RIP, which may or may not be in front of
>
the proofer, depending on the particular workflow chosen). The proofing
>
system is calibrated by the proofing RIP generating test charts,
>
and then reading them into the proofing RIP using a densitometer.
>
Any variation from expected proofing printer response is
>
then compensated for by the proofing RIP color correction.
>
(Simple concept, but it needs to be executed well if it is
>
to be effective.)
Graeme,
After a great post regarding your newspaper configuration, which is normally
how we set things up as well, this post seems less of a clarification than
the question from Mr. Lindstrom. A good proofing system has at least two
components aside from the hardware (which you call I believe the proofing
printer (which I understand as the printing device): 1. which is responsible
for maintaining the printer in a known and repeatable state, and 2. the
color profiles, tables, etc, etc. which handle the conversions from your
press conditions your printer conditions. Are you saying that you send a
density chart and then compensate within the proofing tables (i.e.
simulation tables) of the system instead of within the calibration tables of
the printing device? This is a very flawed configuration as you can
guarantee no repeatability and any problem with your printing device would
results in the possible need to correct your proofing tables.
Also, what got my attention was your use of density to keep the printer in
the desired state instead of using colorimetric calibration. In order to
gurantee the same proof at the print site and another site, and to reproduce
the same print time and time again, it is necessary to keep establish the
printer's response with more than just 20+ patches of density values. While
density is great for imagesetters, CTP's etc., it is not the the best
solution for proofing linearization.
Regards.
Darrian Young
MGV
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