Re: PDF X4 workflow and CM
Re: PDF X4 workflow and CM
- Subject: Re: PDF X4 workflow and CM
- From: Jan-Peter Homann <email@hidden>
- Date: Mon, 23 Aug 2010 15:12:37 +0200
Hello Paul and all,
Sorry for the late repy, burt I was offline from the list for some times..
Am I right in the interpretation of your e-mail, that text and tints in
RGB from InDesin are NOT converted to ICCbased RGB objects ? Just
DeviceRGB ?
In this case, the produced file would not be PDF/X-4 compliant !!
Or are this PDF elements still ICCbased, but have embedded RGB-profile
different to the InDesign color settings ?
One question to the audience:
Currently in Adobe based printing workflows for coated paper, it is
common to use the transformation method relative colorimetric with
blackpoint compensation for RGB to CMYK. PDF/X-4 is not able to
transport the information for blackpoint compensation, if RGB-elements
ar part of the final document.
Because of this, I recommend to muy customers to create CMYK+Spot only
PDF/X-4 (line PDF/X-1a plus transparency).
Any comments on that ?
Regrads
Jan-Peter
Paul Sherfield wrote:
Hi
I am running some 'real world tests' on PDF X4 files for the UK
DigitalAdLab. We have prepared 12 'test' ads with differing colour spaces
and profiles for raster and vector files, and using ISO coated v2 300ECI as
the output intent.
To test what we believe the ad clients will need, common colour appearance
from all suppliers if PDF X4 is to be used, we are processing these files
though a number of vendors CtP/colour server workflows.
First results are interesting, not withstanding differing CMM's, vendor
specific RI's ect., if the CM settings are common to the systems a similar
result can be obtained for images and vector files.
But, and this is a big but, text and tints in RGB. The master files were
prepared in Indesign CS4 which has a document colour setting for RGB and
CMYK, however, as far as I can see this is not 'embedded' in any way. So the
workflow uses the RGB default profile for these files.
In practice this does cause the CMYK colour breakdown of RGB text and tints
to change according to the Indesign document profile and workflow default
profile match or mismatch.
Am I missing a trick here, or is this an area where there is a gap in
document CM in this workflow?
Comments please.
Paul Sherfield
The Missing Horse Consultancy Ltd
Telephone: 01442 871752
Mobile: 07899 906385
http://www.missinghorsecons.co.uk
Apple Solutions Expert-Print & Publishing
Member - UK TC130 Technical Advisory Group (ISO 12647 Printing Standards)
Member - BPIF Technical Standards Committee
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