Digital BW, The Print

Terry,

>Just trying to sort out the differences between these two ink sets. . . . 

>Am I correct in saying that the primary difference between UT-3D and UT7 is
>the tonality (i.e. "colour") of the cool toners and having a Lab a*
>(selenium) toner instead of a Sepia toner in the Y position?

Yes.

>Would it work to put the Lab a* toner into the Y position in a UT7 set,
> and then use QTR to create a selenium curve?

You could, but the UT7 cool toner already has enough magenta (actually R800
Blue) in it.  In fact, being able to deal with what is sometimes an excess
of magenta is one of the points of the 3D inkset.  Between paper and inkset
batch differences, this can become a problem.

> Is it difficult to create split tones using QTR and either inkset? ...

I'm not a QTR expert.  But, I think it depends of whether you want to split
the tones between highlights and shadows, or between 2 different areas in
the print.  It's easy to have highlights be cooler or warmer.  I think
you'll have trouble getting QTR to split tones by area, however.  That is
one advantage of the Epson driver -- RGB curves approach.

Paul
www.PaulRoark.com