Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Tyler Boley" <tyler@...> 
wrote:
>
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Roy Harrington"
> <roy@> wrote:
> ...
> > If you were to go to 720x720 the 20pl dot would not be large enough 
> > for a dMax black so you would need to use (8,20,40) and the lightest
> > gray areas would show half as many bigger dots as the above cases.
> > 
> > So based on the dpi you pick, you must pick a large drop that is big
> enough to
> > give a dMax black.
> 
> So there is an obvious math relationship between a size 40 dot
> grouping at 720 dpi, and a size 20 dot grouping at 1440 dpi.
> I imagine physical oddities and realities of ink on paper though, so
> they may or may not result in the same actual density and explain why
> different dot size printers give different dmax, given various
> ink/media characteristics.
> Perhaps?
> Tyler
>

Yes, basically you need a certain total volume of ink to produce a certain
density, so the first approximation is just (number of dots) x (size of dot).
But all the little differences of paper, coating, dropsize and dot gain have 
secondary effects that give some variability.

Roy