"He who marches out of step hears another drum." ~ Ken Kesey
Some RIP software will allow access to the Spot Function, but it is not common.
The order and shape of the array is entirely up to the designer and the possibilities are almost limitless. I should point out that it is rare for anyone to work directly in native Postscript. This is the software that drives the RIP. Some RIP software will allow access to the Spot Function, but it is not common.
It is my belief, that screen printing on textiles needs its own book. Please go back and review the not proportional ratio screen i posted. Is that in the book?
Have you seen Mike's latest wheeze?Imagine that you can print from 10-90% quite happily but lose detail after that. Mike has got a trick where the dots are postscript down to 10% and remain at that size so that you can print them. To get a 9% dot he removes some of the dots and progressively to 1%. It doesn't look perfect but it's a really good approximation. It's a sort of stochastic approach to AM dots.
Postscript offers almost infinite possibilities on how to create a halftone model depending on the printing method
For us, the ideal halftone model would be an intelligent mix of FM and AM halftoning based on the rate of change of surface detail over any defined area.