Digital BW, The Print

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?