QTR-Quadtone RIP

Thanks to everyone who replied.  I have access to a microscope so I 
took a part of the print and examined it visually at a magnification 
where I can see the individual ink dots.  I can see that all the dots 
are grey and there are no other colours being laid down so my only 
conclusion is that the grey inks are not truly neutral and do have a 
warm tone to them (or there is some tone coming from the paper).

So now it looks like I am going to have to use the toning channels to 
bring the print back to a true neutral.  Is there a good method for 
establishing how to set the toning channels to achieve a neutral 
print?  I have access to an eye-one.

Bill

--- In QuadtoneRIP@yahoogroups.com, "Michael King" <drmrking@...> 
wrote:
>
> Also what your spectro reads is going to depend on the colour of 
the paper
> the inks are printed on.
> 
> On 18/10/2007, Michael King <drmrking@...> wrote:
> >
> > Isn't that because the blacks are not neutral. They are naturally 
warm
> > carbon?
> >
> > Mike
> >
> >
> >  On 18/10/2007, etlblbt <bill.brandt@...> wrote:
> > >
> > >   Hello,
> > > I have just started trying quadtone RIP and I have tried to make
> > > my first profile for my EPSON R2400 which is loaded with the 
standard
> > > inkset. In the ink descriptor file I have set the density 
values for
> > > the light black and light light black inks (measured using a
> > > spectrophotometer) and have set all the other inks to 'not 
used'.
> > >
> > > When I print out a test strip (the 21x4 random) and analyse it 
with my
> > > spectrophotometer I can see that the colours are not neutral 
(when
> > > converted to RGB there is quite a lot less blue than the other 
two
> > > channels) and the print visually has a brownish tone.
> > >
> > > Is there something else I need to do to prevent the colour inks 
from
> > > being used other than setting them to 'not used' in the ink 
descriptor
> > > file.
> > >
> > > Apologies if this is all in a FAQ somewhere. If you could point 
me to
> > > it that would be great.
> > >
> > > Regards, Bill Brandt
> > >
> > > 
> > >
> >
> >
> 
> 
> [Non-text portions of this message have been removed]
>