Dear Jyrki,
Welcome to the real world of color management.
There are many techniques to work around this problem.
The easiest, in my view, is to profile the press with and
without the lamination.
Then, proof the job with the lamination applied but give the
proof without the lamination applied to the press for matching.
Best / Roger Breton
De :
eci-en-bounces@lists.callassoftware.com
[mailto:eci-en-bounces@lists.callassoftware.com] De la part de Jyrki
Kela
Envoyé : 24 novembre 2009 06:41
À : eci-en@lists.callassoftware.com
Objet : [ECI-EN] Matt Lamination turns skin tone to reddish
Dear all
We got a strange effect, when we matt
laminated offset printed job. Colour of skin was normal at printed sheet, but
it turns really reddish after lamination. Different was not small. It had never
happened to us before. Usually laminated job turns to be little bit yellowish,
not reddish.
At the first I thought that there was some
chemical reaction between magenta ink and glue of laminate or heating of
lamination effect to magenta. But I measured dot gain and checked what process
colour there are at skin tone. Dot gain of laminated sheets was about 5 %
higher than unlaminated. At this skin tone there was mainly only magenta and
yellow ink. Result of higher dot gain of both yellow and magenta causes
reddish tone, compared to tone where there are all cmyk inks causes only darker
tones.
Do you have any experience, is this just
because optical phenomenon of uneven surface of matt laminate plastic? Does
this happen with gloss laminate? How do you deal with it? It is not easy to
assume to what tone lamination will effect strongly. Most of case (99.9 %)
lamination does not change tone so strongly. Then to use special lamination ICC
profile to all laminated job is not possible?
Best
Regards
------------------------------------------------
Jyrki Kela
Quality and Technology Manager
Erweko Painotuote Oy
Tel. +358 9 7310 2319
Mobile +358 40 7 357 357