Hello all,
For neutral color areas and skintones F27 and F39 are very close
together. The visual differences are mainly in the area of saturated blues.
FOGRA39 represents especially concerning this color area better real
world prints.
If you have FOGRA27 Proofs, the resulting blues of a well balanced print
will be more reddish than the proof.
For a good conversion of F27 PDF/X 1a files, I recommend a PDF
Colorserver with (dynamic) DeviceLink profiles.
The DeviceLink should preserve the separation but limit the TAC to 330
or 300.
Please not, that some devicelinks donĀ“t correct the blue problem,
because they are wrong calculated...
A good starting-point are e.g. solutions from GMG or Alwan.
They offer the possibility of an online test or a demoversion, which You
could use with a real world job.
Regards
Jan-Peter
Paul Sherfield wrote:
Hi
I am surprised that you are seeing any difference re Fogra 27 to Fogra 39
printing conditions on press.
The TVI curves are the same and there is only a small difference in the Lab
values for the Yellow, around 1 De.
So the press should print CMYK separations from Fogra 27 or 39, if setup
correctly.
I have the report from the BPIF test Day at Heidelberg to the UK where we
tested the above profiles and G7 for colour appearance. Contact me on
paul(a)missinghorsecons.co.uk
and I will send it to you for reference.
Regards
Paul Sherfield
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