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
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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(a)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(a)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