Hello Paul
First I would use the curves that correspond to the ISOcoated/ISOwebcoated
printing conditions. If you look at the characterisation data of the
standard profiles it quite clearly gives around 14% dot gain in 50% for
ISOcoated and around 17% for ISOwebcoated. So this would mean curve A for
ISOcoated and curve B for ISOwebcoated
Secondly I don't think ISOwebcoated profile should be specified as heatset
web offset profile. To us as papermaker it makes more sense to categorise
these profiles according to paper type than printing method. We e.g.
recommend for many of our heatset grades (bluish shade better quality
papers) ISOcoated profile rather than ISOwebcoated, which suits well for
standard LWC's (yellowish shade).
BR Jouni Marttila
_________________________________________
Jouni Marttila
Project Manager
M-real Corporation
Technology Centre Kirkniemi
FIN-08800 KIRKNIEMI
Finland
Tel: +358 (0)10 464 2908
Fax: +358 (0)10 464 2412
Mobile: +358 (0)50 381 9085
Email: jouni.marttila(a)m-real.com
www.m-real.com
-----Original Message-----
From: eci-en-admin(a)lists.transmedia.de
[mailto:eci-en-admin@lists.transmedia.de] On Behalf Of Paul Sherfield
Sent: 4. huhtikuuta 2005 14:48
To: eci-en(a)lists.transmedia.de
Subject: [ECI-EN] Re: TVI and ISO ICC profiles
Hi
This has been troubling me for a little while:
The TVI curves in the Altona Suite, A to F, especially curves B, C, D and E,
as applied to Paper type 3, Heatset web offset with the ISO web offset ICC
profile.
Surely if the ICC profile is based on a standard printing condition it will
only print at it's best if these conditions are matched on paper, Lab, TVI
etc.
So why are there four curves for this condition, and the uncoated printing
conditions, I understand and agree with the TVI 'increase' for the black, as
it is normally printed on the first unit. However surely the plates being
positive or negative is irrelevant to the ICC profile which is looking for
the correct TVI as measured on the printed sheet?
The difference between curve B, positive plate, paper type 3 on a 40% with a
TVI of 16% and curve D with a negative plate, paper type 3, and 40% with a
TVI of 22% is large. What does the ICC web offset profile need?
The plate type has no effect on the TVI required when printed on paper via
the ICC profile. Yes the plate type will effect this but should be
controlled by output curves at film production.
How do these curves apply to CtP?
Which is the correct/best curve for each ISO ICC profile?
This is easy to workout for ISO coated but not for the other 3 ISO standard
profiles.
Regards
Paul Sherfield
The Missing Horse Consultancy Ltd
Telephone: 01442 871752
Mobile: 07899 906385
Apple Solutions Expert-Print & Publishing
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