Salut Hervé,
additionally to Hanno’s answer: A prerequisite of use of the profile
“PSO_Coated_v2_300_Matte_laminate_eci.icc” (seems to be the right choice for velvet) is a
tone value increase 10% higher compared to Fogra39. That means, in the 40% tone you should
set an increase value of 13% + 10% = 23% for CMY and of 16% + 10% = 26% for K. I don’t
know the effects of “velvet” but I think you should not go beyond 10%+ because that
increase is a compensation of the light refraction in the film layer depending on its
typical thickness. This is only a rough rule of thumb, and for glossy laminate you can
work with the same curves.
Best regards,
Dieter
Von: eci-en-bounces(a)lists.callassoftware.com
[mailto:eci-en-bounces@lists.callassoftware.com] Im Auftrag von Hanno Hoffstadt
Gesendet: Montag, 26. Februar 2018 09:40
An: eci-en(a)lists.callassoftware.com
Betreff: Re: [ECI-EN] Question about velvet lamination
Hi Hervé,
I am not familiar with "velvet films" as a term. Are they very silky, matte
(fuzzy) and at the same time with a wide "glossy sheen" which captures much of
the ambient light, but directional? So that intensity changes with orientation?
This is what I assume for the following...
It is a difficult case for proofing. The characterization data are for 45/0 geometry, but
the viewing is more like diffuse illumination with an overall direction, which in this
case can make a big difference.
It may help to get the viewing closer to a 45/0 or 0/45 situation by blocking much of the
other diffuse ambient light. Then a print-to-proof match which measures close to 0 Delta E
will also appear close.
F49 is probably a bit too light in the shadows, you may see more contrast on the laminated
print. But it should get the color shift approximately right if your screen is around
150-180 lpi.
(F49 and F50 are not well suited for extremely fine or coarse or NP/FM screens, where the
color shifts will be smaller.)
But this is only the colorimetric part of the story... without the surface properties.
There is no proofing substrate which matches the surface of matte and silky lamination
well.
The alternative can be to laminate the proof with the same film, if you have access to
such equipment.
Important: then you need also a profile (or "gamut" in GMG-speak) of the
laminated proof (print an ECI2002 or IT8.7/4 with a linear transformation on your proofer,
laminate and measure).
Do not assume that you can simply make a F39 proof and laminate it to get the same optical
effect and color shift as on the print - much of the color shift is additional optical dot
gain which depends on the screen.
Best regards
Hanno
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Dr. Hanno Hoffstadt
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Am 26.02.2018 um 03:09 schrieb LYAUDET, Herve
<h.lyaudet@altavia-paris.com<mailto:h.lyaudet@altavia-paris.com>>:
Hello everyone,
I request an expert opinion about velvet lamination. Maybe one of the ECI members can help
me ?
Can i use the F49 matte laminate characterization for a velvet lamination?
..Velvet lamination is very specific..
Best regards.
Hervé
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Responsable colorimétrie et flux de production
ALTAVIA PARIS
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