Thanks Louis!
Sorry for my ignorance, but can you tell me what ICJ/OPM and UT7 are?
Is it easy to use non-Epson inks in the 4000?
Is QTR compatible with ethernet or just USB (on Windows XP)?
--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Louis Dina"
<lbdina@c...> wrote:
> Metamerism is a pehnomenon where two samples match exactly under
one
> lighting source, but when viewed under lights with a different
spectral
> curve, they look different. So, if your print looks great in
daylight,
> but you get some weird shifts or crossovers in fluorescent or
> incandescent lighting, metamerism is rearing its head. Dyes and
> pigments can sometimes have peaks when their molecules are excited
by a
> specific part of the visible spectrum. Some inks are more
metameric
> than others (and pigment inks are more prone to metamerism than
dyes).
>
> Since prints are nothing more than reflected light, your overall
> coloration will inevitably change somewhat depending on the light
> source used to view them. Ideally, there will be no such shift
and
> your prints will just appear a little warmer when viewed under a
warmer
> light source.
>
> From my experimentation, I have found that the yellow ink in the
Epson
> UC inkset is the most liely to do weird things under different
lighting
> situations. So, I try to eliminate or at least reduce the amount
of
> yellow in all my profiles. This reduces metamerism significantly.
>
> A RIP like QTR or IJC/OPM allows you to build a profile that is
> neutral, has minimal metamerism, is linear, and has the best Dmax
a
> paper/ink combo can deliver.
>
> Lou
>
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "njms200"
> <njms200@y...> wrote:
> > Thanks...I took a look at that info and it was helpful.
> >
> > I also printed a few photos on luster paper. When I first saw
them,
> I
> > was stunned by the quality. Then I turned a photo a few inches
and
> it
> > turned purple! Is that what you refer to as metamerism? Is
there a
> > solution?