QTR-Quadtone RIP

Contact Dan Burkholder for guidance on using color pigment inks.
  -----Original Message-----
  From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com]On
Behalf Of David
  Sent: Thursday, February 21, 2008 6:21 PM
  To: QuadtoneRIP@yahoogroups.com
  Subject: [QuadtoneRIP] Re: How does the printer / QTR lay down different
color inks


  Right now I'm printing with matte black ink only at 1440x1440 dpi to
  create digital transparency "positives." I use these in an UV
  exposure unit to create etching plates from UV light sensitive film--
  the dots of ink block underlying areas on the plate from being
  exposed and these develop differently than areas that are exposed to
  the UV light.

  My image on the transparency is made up of black dots only, similar
  to a bitmap image, and this creates the "bite" (low spots that hold
  ink) in the etching plate. The problem is that the matte black in
  does not adhere well to the transparency films I'm using and can be
  smudged with my finger.

  I have two solutions: to switch to photo black ink (which is less
  opaque than matte black) or to create the transparency using color
  inks, for example all magenta, or all cyan, or red or green.

  In essence, I'm trying to replace all my black dots of ink with all
  colored dots of ink that I hope will have similar or better UV-light
  blocking capabilities.

  The idea of using colored inks came from someone who uses them for
  digital negatives, and says they give better coverage than black
  inks.

  So I'm trying to find a way (see my settings below) to use color inks
  in place of the black only ink.

  Does that help explain it? Best, David.

  --- In QuadtoneRIP@yahoogroups.com, "Olivier" <odesmais@...> wrote:
  >
  > > I'm going to still try using QTR to print in color, and here's
  what
  > > I'm thinking:
  > >
  > > For printing Magenta only:
  > > * default ink limit: 85
  > > * black boost: blank
  > >
  > > Magenta Ink
  > > * Density 100
  > > * Limit: blank

  > > Otherwise, no changes to gray or toner curves, and no
  linearization. (And I might repeat this, only using Cyan).
  > >
  > > For printing with Magenta and Yellow (to get Red), I'd do same
  settings for Magenta and repeat these settings for Yellow.
  > >
  > > I'll print at 1440x1440 super to get the dot structure I need for
  my etching plates.
  > >
  > > I have tried to understand QTR but mostly I'm baffeled by it all,
  so I'm sort of winging it (trying things without knowing what I'm
  > > doing).



  


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