QTR-Quadtone RIP

Thanks Roy -

Is this what you are suggesting for the Magenta and Light Black channels
?

(I kept 50 as the Density setting for Magenta, and entered in your
recommended Limit of 20, and then specified that Light Black should be
derived from Magenta, with a limit of 20. )

See http://www.kenleegallery.com/images/carbon/RoySuggestion.png
<http://www.kenleegallery.com/images/carbon/RoySuggestion.png>

If so, where does the number 40 come from ? Don't you mean 50 ?
Shouldn't the limit be 50 / 2, or 25 ?

Many thanks !

- Ken


--- In QuadtoneRIP@yahoogroups.com, Roy Harrington  wrote:
>
> Ken,
>
> I think you are doing the doubling up of inks incorrectly.
>
> For instance you have:
> Magenta is 50% of black -- LK is the same ink.  You don't want to
halve the
> "density" value, you
> want to have the 50% density value but take half the ink from M and
half
> from LK.
> So you make M=density 50 but ink limit 20 = 40/2,  then make LK just a
copy
> curve from M not one
> of the gray inks.
>
> You might find it easier to try without the doubling first.
> Get that right and then do the split usage of two jets.
>
> Roy
>
>
>
> On Sat, Jun 29, 2013 at 5:23 AM, kenleegallery kenlee333@... wrote:
>
> > If you look at
> > http://www.kenleegallery.com/images/carbon/PlatineCalibration.jpg
you
> > will see the readings for the most dense patch of each ink are at
the right
> > of each ink.
> >
> > Depending on the size of your display, your browser may have reduced
the
> > size of the image. If you view it at 100% you should be able to read
the
> > image.
> >
> > Note that Magenta and Light Black use the same ink, so their values
are
> > divided by 2 in actual use. Similarly, Light Magenta and Light Light
Black
> > are handled the same way.
> >
> > Cyan: 1.64 which matches 78% of Black
> > Magenta: 1.22 which matches 50% of Black (divided by 2 because of
Light
> > Black)
> > Yellow: 0.28 which matches 10% of Black
> > Light Cyan: 0.77 matches is 31% of Black
> > Light Magenta: 0.61 which matches 23% of Black (divided by 2 because
of
> > Light Light Black)
> >
> > Light Black: same as Magenta
> > Light Light Black: same as Light Magenta
> >
> >
> >
> >
> > --- In QuadtoneRIP@yahoogroups.com, "ccolbertbw" ccolbert@ wrote:
> > >
> > > Ken,
> > >   1) Be sure you make the calibration sheet with calibration mode
chosen
> > in the print driver.
> > >   2) Make sure you print the step wedge normally (i.e., without
> > calibration mode).
> > >
> > > I can't make out all your measurements.  What is the reading for
the
> > most dense patch for each ink?
> > >
> > > --- In QuadtoneRIP@yahoogroups.com, "kenleegallery"  wrote:
> > > >
> > > > I  measured the QTR calibration page with a spectrophotometer
and made
> > a
> > > > second calibration print with adjusted ink density.
> > > >
> > > > Then I determined the relative densities and created a curve.
Then I
> > > > printed out a 21-step wedge.
> > > >
> > > > The wedge gets darker in the middle, then gets lighter, then
gets
> > darker
> > > > again.
> > > >
> > >
> >
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>
> --
> Roy Harrington
> roy@...
> www.harrington.com
>
>
> [Non-text portions of this message have been removed]
>



[Non-text portions of this message have been removed]