Thanks for chiming in, PE...I understand the theory behind tri-color printing, and also that many people produce excellent results by doing so. But I'm trying to reconcile that with what (I think) the graphs are telling me.
I understand that the filters have virtually 0 overlap, but the sensitivity curves of the different dye layers in the paper do. Let's take the example of an exposure with the 47B filter. It has some transmission all the way up to about 500nm. In the region between 450nm and 500nm, the blue- and green-sensitive dye layers both have some sensitivity (according to the graph, differing by about 1.8 log E ) It stands to reason (in my mind) that both will be excited by the energy transmitted by the 47B filter, and that there will be some magenta dye formed by the blue-light exposure. Now, I realize that the magenta will be formed in a very small proportion to yellow, but it seems like it would happen. Now, is it just the case that it is too little to be meaningful, or is there some other mechanism at play that means absolutely no magenta dye is formed?
And on a related note, do I interpret the graphs correctly to mean that a 61 filter is probably not appropriate for tri-color printing, and a 99 would be preferable?
Thanks, PE, and anyone else who might chime in, for your help.
--Greg