QTR-Quadtone RIP

--- In QuadtoneRIP@yahoogroups.com, "Gary Reese" <pcacala@...> wrote:
>
> <<  Making digital negatives with black ink really doesn't yield the
best 
> results. >>
> 
> Considering that photographic papers are orthochromatic, it makes
little sense to create a digital negative with a matrix of colored
dots. This seems to be something not typically addressed.

That's an understatement. 

Multigrade papers have one sensiometric curve for green exposure,
another for blue. Neutral B&W inks are the only way to tame that mess.

And when you throw UV processes like platinum into the mix, things get
even worse for colored inks. Although it is possible to run a QTR cal
on a UV densitometer and build curves that use all the colors in their
"effective" UV densities. B&W inks make life a lot easier.

What really makes a nice negative is something QTR isn't strong at:
laying down a pretty dense pattern of low dilution inks, and using
minimal overlap. I've just been amazed that QTR can drive negative
densities up to insane levels (dmax approaching 3).