QTR-Quadtone RIP

Hi Grant,

There are lots of inksets and ways to make B&W prints.  I think they
all have some
tradeoff of advantages and disadvantages.  To make neutral gray they all involve
some color pigments because the black/gray carbon pigments are all a bit warm
in tone.  The UltraChrome ink method mixes the colors in at print time using
software control.  The K7 method mixes each individual ink with the necessary
color pigments to get the desired tone.

With a 9500 I'd recommend the K6 inkset because the older printer has fairly
large ink drop sizes and the color ink method would show the color dots.
There are already quite a few profiles for this setup using K6 inks.

Roy

On 10/20/07, grant.kernan <akphotos@...> wrote:
> 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
> > >
> > >
> > >
> > >
> >
>
>
>
>
> Yahoo! Groups Links
>
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>