Re: was: Brightener in Epson Premium Glossy
Re: was: Brightener in Epson Premium Glossy
- Subject: Re: was: Brightener in Epson Premium Glossy
- From: "Adriano Von Markendorf" <email@hidden>
- Date: Mon, 30 Sep 2002 09:11:27 -0300
<snip>
>
<http://mitglied.lycos.de/whiteness/BrightnessReview.pdf>.
Good article, thank's to put it on the table.
>
The paper touches on what effect using a UV filter has on
>
measurement (enough to convince me that UV filters are
>
useless when trying to create color profiles, as opposed to
>
measuring paper whiteness).
Very intersting subject. I hear somany times the same argument.
I wondering if this kind of problem could be cause problems reading pure
yellows patches, I mean, the resulting profile come with somany cyan and/or
magenta - more noticiable in 100Y using semmigloss media (some uv, about 4)
and Guardian inks -
A very funny thing is, I get practically the same problem using Colorblind 4
and ProfileMaker 4, I haven't tested with PO 4.
>
There is no doubt that the presence of UV brighteners makes the
>
appearance of a print more dependent than ever on subtle
>
characteristics of the light source.
Could be better use a non-UV reader with a diferrent light source like
spectrocam? they claim to get better espectral response (lees uv reading and
a little more wavelenght range) from your xenon light.
>
I think the simplest way of avoiding these sorts of problems in proofing,
>
is to try and match the whitener content of the proofing paper to
>
that of the target. Even if the different effects the instrument
illumination
>
has on the whitener compared to the viewing illumination, is fully
>
compensated for in the profiling software, any differences in the
>
UV level of the actual viewing conditions can cause noticeable shifts
>
in color.
I saw in the list comments about this capacity of abstract the uv component
from PM4.
Regards,
Adriano von Markendorf email@hidden
"I-C-Cm vitamin's inside" Rio de Janeiro - Brazil
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