Many ways to go, but one would be to find your desired D-values and TVI and then create a
custom ICC-profile. You can then choose to either recommend this profile to your customers
or make life (maybe) easier and only recommend one, i.e ISOcoated v2 300 ECI and then set
up a Device Link conversion. Your target LAB values will off course be stored in your
char´data.
Den 24. feb. 2010 kl. 15.55 skrev Juris Valdmanis:
Thank you Lars!
How do you set/choose targets for papers type 2.5?
Also I am wondering why there is no such type 2.5 paper in ISO yet?
regards,
Juris
Lars Jacobsen <lars.j(a)merkurtrykk.no>
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2010.02.24 16:45
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Re: [ECI-EN] paper types and target LAB values
Papertype 2....
I call High quality Silk paper type 2 even if the B values are more like B-5. Only on
these papers can we reach Fogra39 within low dE.
We have made a custom "Papertype 2.5" category for all those matt papers wich
will give higher dotgain and does not dry as fast as Silk does. We lower our Densities and
reaches aprox 90% gamut volume of Fogra39 (close to dE5). This way we can also reach TVI
A/B without problems.
We put quite many paper qualities under our "Papertype 2.5" category and
measure and calibrate on one of them. We also explain this to our customers, specially if
they want contract proof. There will be some mismatch when comparing to Fogra39-certified
proofs.
Den 24. feb. 2010 kl. 14.10 skrev Juris Valdmanis:
Hello dear list members.
First of all I would like to thank everyone who helped me last time I asked my questions!
Your help was valuable!
But now I have more questions regarding printing to ISO.
In ISO documentation there are Lab target values for primary and secondary colors for
different paper types.
As we are sheet-fed printers we are interested only in paper type 1(gloss coated), type 2
(matt coated) and type 4 (uncoated white).
As I understood from documentation (I have only an old english version of ISO 12647-2 and
english is not my native language as you may already realized) all papers what we use for
printing I have sorted in these three types of paper.
But from documentation papers type 1 and type 2 have the same Lab target values for
primary and secondary colors. >From my previous conclusion papers like fine gloss (with
3 coating layers) and rough matt (with only one coating layer) have same Lab target
values.
No problems with type 1 (gloss) papers, as we can get very close to target values and
densities are ordinary.
But for mate papers (type 2) we have to rise densities to get acceptable Lab values. It
could be understandable as paper surface is rougher and you have to apply more color to
get same saturate colors as on paper type 1.
Problem is that higher densities however lead to different problems in postpress as paper
is not drying well and it smears.
Did I understood correct ISO documentation or am I missing something?
And also I did not find answer to another question: Are Lab target values for wet or dry
colors?
Thank you, everyone.
regards,
bebris_______________________________________________
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