RE: The MESS at the PRESS campaign
RE: The MESS at the PRESS campaign
- Subject: RE: The MESS at the PRESS campaign
- From: Henrik Holmegaard <email@hidden>
- Date: Mon, 5 Apr 2004 22:25:01 +0200
The trouble is that in image design RGB is the conventional interchange
format and in page design CMYK is the conventional interchange format.
In QuarkXPress page design 1987 - 2004 CMYK objects with different ink
limits and black replacements will in almost all cases be placed side
by side.
And the page design application will make no attempt to harmonize the
ink limits and black replacements for the intended printing condition.
Therefore, the page may contain different ink limits and black
replacements for offset and possibly different ink limits and black
replacements for non-offset,
- CMYK 390% with low UCR for ISO 2846 inks and offset papers,
- CMYK 300% with medium GRC for ISO 2846 inks and offset papers
- CMYK 240% with low UCR for a digital printing device.
This is all CMYK but it is only able to form color in a coherent sense
if the assumption is made that all CMYK is essentially say SWOP, which
is not the case.
This is all CMYK but it is only able to print properly if the
assumption is made that all CMYK is essentially for the intended
printing condition, which is not the case.
This again means that steps need to be taken to try to harmonize the
CMYK values emitted by QuarkXPress to those for the intended printing
condition, for instance
- the iQueue documentation suggests harmonizing in a hotfolder before
placing so you know that all CMYK is the same CMYK for the print.
- the ECI PDF/X-3 cookbook suggests converting to RGB before placing so
you know that all CMYK is the same CMYK for the print.
- the HP DesignJets offer to assign a CMYK CSA to PostScript emitted by
QuarkXPress for the same reason, to control the CMYK for the inkjet
printing condition.
The assumption behind ISO 12647 and PDF/X-3 is that all objects in the
page should respect the same separation parameters.
Now let's look closer at conversion technologies to try to understand
the complexities that ensue if attempts are made to shore up a CMYK
workflow for page design.
(Darrian_2)
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