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@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@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
--
Dr. Hanno Hoffstadt
Senior Color Scientist
------------------------------------------------------------------------
Markbronner Weg 6
D-89077 Ulm
Germany
phone: +49 731 1406 4651
skype: hannohoffstadt
GMG GmbH & Co. KG
Moempelgarder Weg 10
72072 Tuebingen
Germany
Phone: +49 7071 93874-0
Fax: +49 7071 93874-22
mail to: hanno.hoffstadt@gmgcolor.com
www.gmgcolor.com
------------------------------------------------------------------------
GMG is a leading developer and supplier of high-end color management software solutions. Our customers span a wide range of industries and application
areas including advertising agencies, prepress houses, offset, flexo, packaging, digital, and large-format printers as well as gravure printers.
GMG GmbH & Co. KG. Registered Office: Tuebingen. Court of Registration: Stuttgart Local Court, No. HRA 381463.
General Partner: GMG Verwaltung GmbH. Registered Office: Tuebingen. Court of Registration: Stuttgart Local Court, No. HRB 382505.
Managing Directors: Ian Scott, Joerg Weihing, Robert Weihing
CONFIDENTIALITY
The information in this e-mail and in any attachments is confidential and may be privileged or otherwise protected from disclosure. It is intended solely
for the attention and use of the named addressee(s). If you are not the intended recipient, please telephone or e-mail the sender and delete this message and any attachment from your system.