Digital BW, The Print

> What tests did you run for metamerism?

Did an eyeball test. Looked at a print under daylight, tungsten and 
Ott Light fluorescent (daylight fluorescent) and observered 
negligible metamerism. Viewed the same image printed with standard 
driver under same lighting and observed unacceptable green-to-magenta 
color shifts due to metamerism. I don't know of another test you can 
do for metamerism since spectrophotometers don't see it. There may be 
some specialized tool that can measure it but I bet I couldn't 
afford it.
 
> What's "UC"?
  
Sorry, I guess I got lazy. UC stands for UltraChrome, Epson's pigment 
based ink used in the 2200.

> How did you trick it?

Good news on this. I tricked the RIP into printing at 2880x1440 dpi 
with Matte Black ink and the results now are improved over the 
default 1440x720 dpi on EEM -- I figured out what I was doing wrong 
that was resulting in a nonlinear grayscale gradient and the results 
are now super -- better resolution and smooth shadow transitions. 
Printing at 2880x1440 on EEM with stock inks through this RIP on the 
2200 yields results that are indistinguishable from Pieziography 
printed images using quadtones. I'll make a separate post on how I 
did it. 

> Didn't it use all the inks on your grayscale image, above?

Judging from a look at the dot patterns with a loupe and from how the 
ink levels are moving when printing using the RIP it seems that the 
RIP is mainly using black, then light black, then a small amount of 
cyan and not much, if any, of the other inks. This is a very 
unscientific observation and should be taken with a grain of salt. 
I'll leave it to folks smarter than me to figure out exactly what its 
doing.