Digital BW, The Print

>I suspect all media undergoes different degrees of metamerism.
>When you view your Epson 1280 dye based ink print under
>two light sources, the degree of metamerism is far less
>than when you view pigmented inks from a 2000P.

The 2000P Epson Archival pigments are famous for their metamerism.

I'm now experimenting with an Epson Archival pigment-based VM-S inkset.  My
major concern was that the metamerism of those Archival pigs would wreck the
concept.  However, it looks like the magenta and cyan pigments do not add
any noticeable metamerism to the base gray ink (which must be slightly
cool).  UltraChrome users appear to notice the same lack of metamerism with
the UC cyan and magenta; the problem is the yellow.

What really surprised me with the experimental vm-s is that the Epson
Archival sepia toner, which has a significant amount of Archival light
yellow, has no more metamerism than the current vm-s sepia toner, which is
composed of MIS pigments.

The Epson Archival and current vm-s certainly do exhibit metamerism when
they are printed with a sepia tone.  They are much warmer under tungsten
than daylight.  Luckily, there is enough magenta in the mix to offset the
famous Epson Archival ink green shift.  The sepia tone simply shifts from
redder under tungsten to more yellow and lower gamut under daylight.  Since
the shift is consistent with what viewers would expect, it is not a major
problem.  I don't think I've ever heard someone complain of the metamerism
in the current vm-s.  It's there, but it just is not an inappropriate shift
that draws attention to itself.

Paul
http://www.PaulRoark.com