QTR-Quadtone RIP

--- In QuadtoneRIP@yahoogroups.com, "Roy Harrington" <roy@h...> wrote:
>
> --- In QuadtoneRIP@yahoogroups.com, "joshhackney" <joshhackney@g...>
wrote:
> >
> > GRAY_OVERLAP=percent
> > 
> > With this setting is the grey ink applied first, so that all of
the black ink is applied OVER 
> all of 
> > the grey ink,  or are the grey and black dots put down
sporadically so they are "mixed"?  
> > Perhaps this differs by printer.  I'm on a 7800 with K3 if that helps.
> > 
> > Is anyone using this setting, or is it outdated and a holdover
from older inksets?
> 
> There's no way to really tell for sure -- al least there's no way to
control it.

Actually, there is. The GIMPprint driver will interleave dots until
the dither pattent is full, only then will it start overlapping. There
is no laydown order control, the laydown will be, essentially, random,
sometimes lighter colors will be on top, sometimes darker ones.

If you tell the driver that the inks are different strengths of the
same color, the interleave will be more intelligent, i.e. it will
never overlay light colors when a single layer of a darker one is
availiable. 

> But given the weaving that is used I'd guess they are mixed randomly.
> I think an overlap in the 10 to 20% range is usually good.

The better the assignment of densities of the lighter inks relative to
the darkest, the smaller the overlap needs to be for good results.