Thanks for the info on Fovea Pro, Doug. I got an inkling as to what the interface would be like by reading the online manual for the halftone dots solution. What I didn't realize was how many "experiments" I would have to go through to get the results that they do. Perhaps I could finally find a use for that math minor I got 15 years ago.
(Yeah, right - I remember pulling out my diffy-Q notebook 5 years ago and looking at it like it was written in Greek - which I guess it was to a certain extent.)
Anyway, since I'm still intensely curious as to whether or not it's POSSIBLE to get the results I'm looking for by removing the grid of white dots created by scanning textured (color) photos, I might just send a sample to the authors of FP and see if they will spend the time to show me what it can do. Then, I can decide if it's worth the immense
amount of time it would take me to figure the whole thing out.