Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Carolyn Frayn 
<carolynfrayn@s...> wrote:
> 
> On Sunday, March 2, 2003, at 08:06  AM, Peter Nelson wrote:
> 
> > Or another example is the recent discussion here on "duotone"
> > printing via Photoshop.  Duotone is a method that was developed
> > for halftone printing, where two separate screens, at angles to
> > each other, are used, two separate inks are used, and there
> > are two printing passes.
> 
> actually duotones use the very same printing method offset presses 
use 
> for 1 to 8 or whatever inks used, cmyk mixes or special inks, or 
spot 
> colors, or whatever... just that you choose what two or more 
precise 
> inks,

Not in Photoshop, you don't.   Photoshop has no direct control
over the ink.   The driver does that.  Furthermore you're not 
creating a true screen when you print with an inkjet printer.

> screenings and angles of same are not only for 
> duotone printing.

But duotone printing does require screens and angles.  Else
it's a simulation of duotone.

Lately I've see a rise in popularity of inkjet "lithography".
Lithography is another printing technique that has a specific 
meaning.    When you simulate it in inkjet it's not lithography.