Digital BW, The Print

Austin,

So are you saying that all these Epson injet printers, even when using
Piezography (drivers(software) and technology(hardware + software))
are actually just printing a good algorithm of a halftone method? 
Does dot size count at all?  How about variability of frequency of
dots within a square inch (or any size area)?  In the book "Adobe
Photoshop for Photographers" by Martin Evening, he cites that "The
line screen resolution (lpi) is the frequency of halftone dots or
cells per inch."  That implies to me that halftone frequency is fixed.
 Isn't it true that in stochastic methods, the frequency is variable?

Thanks! Trying hard to understand...
Cathy


--- In DigitalBlackandWhiteThePrint@y..., "Austin Franklin"
<darkroom@i...> wrote:
> > > That (the Moire patterns) can be eliminated in standard cell
> > based halftone
> > > process.  What you are referring to as "halftoning" is actually
called
> > > "ordered dither", and as I said, is only one of many algorithms
> > that can be
> > > used in halftoning.
> >
> > I'm curious about how they can deliver a print without the moire
pattern
> > visible while using a halftone technique other than stochastic...
> > There must
> > be other techniques I'm not familiar with.
> >
> > So offset press prints with visible moire patterns are "ordered
> > dither", the
> > prints without are "stochastic dither"... or something else?  Then are
> > inkjet prints "stochastic dither" or are they a different beast
> > altogether?
> 
> If you are getting moire patterns, then the halftone algorithm is
not very
> good.  As I said, ordered dither doesn't have to give moire, and
there are
> different methods to do ordered dither too...
> 
> I did this work some 10 years ago, I would have thought it would be
old hat
> by now!  I may even still have the microcode from back then...but it
would
> take some digging.