QTR-Quadtone RIP

Hi fellow printers, 
 Please excuse my ignorance, but I thought that it was a good idea to just  
 dedicate a printer to a neutral black and white - shades of gray ink-set. 
 -Jon Con's K6 or K7 neutral. I would think that using any amount of color
 will cause larger color shifts when viewed under differing light sources. 
 A color cataloge that I designed used a lot of neutral grays in the back-
 grounds and although it was perfect in a 5000K viewing box the "neutral"
 shifted under daylight, tunsten and flourecent conditions. These were 
 CMYK process colours and offset printing. 
 My main area is in photographing art and I have used an Epson 3000 
 piezography to reproduce charcoal and pencil drawings with great results. 
 What I would like to do is to covert my Epson 9500 to an all gray ink-set. 
 Here I would use the Quad Tone Rip. Does this forum talk about this or am 
 I in the wrong user forum?
  Grant Kernan
 
 
 --- In QuadtoneRIP@yahoogroups.com, Howard Shaw <glassman@...> wrote:
>
> Hi Bill
> 
> The usual methodology is to regard the untoned curve you have already 
> created as the "warm" curve and then create a "cool" curve. Once you 
> have these, at the point of printing, you can use the Curve set up 
> sliders to mix the two to produce a neutral that you are happy with.
> 
> To create a cool curve you will need to add some cyan and some magenta. 
> There are a number of ways you can approach this. Perhaps the simplest 
> is to use the 'Copy Curve from' option in the Ink Setup tab of the Curve 
> Creation dialog.
> 
> There you can set the Magenta & Cyan inks to copy the LK curve and the 
> LM & LC inks to copy the LLK curve. Restrict the ink limits to fractions 
> of the LK & LKK curves. You will need to experiment with the limits 
> until you are happy with the tone. Look at other cool curves made using 
> OEM inks for examples.
> 
> There are other ways including using Toner 1 & Toner 2 as you suggested 
> or the Load Curve facility but these are more complex (but are more 
> fine-tuneable).
> 
> Howard
> 
> PS There can't be more than 2 Bill Brandt's so I think we know know each 
> other!
> 
> etlblbt wrote:
> > 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]
> >>
> > 
> > 
> > 
> > 
> >  
> > Yahoo! Groups Links
> > 
> > 
> > 
> >
>