QTR-Quadtone RIP

Homer,

I can't tell with the information I have what might have gone wrong.

Maybe off list you could send me screen grabs of each step, the paper and
inkset information, and the curve you're printing the linearization 21-step
with and then embedding in the ICC.

Paul
www.PaulRoark.com

On Wed, Dec 5, 2012 at 3:35 PM, remononaz1 <homershannon@...> wrote:

> **
>
>
> Paul:
>
> I gave this a shot as soon as I got home. Having read your instruction
> several times, I was quite confident of the process and it proceeded very
> quickly.
>
> However, the results are not good. There are no surface artifacts,
> indicating that the blue curve is still holding down the Eboni ink, but the
> tones are too dark. I'm reading 72 at 50 and 85 at 65.
>
> Any ideas why the .icc created would yield such dark levels? When I print
> the curve with printer controls, G2.2, no icc, 50 reads 48 and 85 reads 82.
> Overall with that ramp I'm off 0 to 3 but it is linear.
>
> Homer Shannon
>
> --- In QuadtoneRIP@yahoogroups.com, Paul Roark <roark.paul@...> wrote:
> >
> > remononaz1 <homershannon@...> wrote:
> >
> > > **
>
> > >
> > >
> > > ...
> > > Once the RGB-ICC is generated do you apply a curve to the image and
> then
> > > print with the ICC or just take the un-altered B&W image and print it
> with
> > > the ICC?
> > >
> > >
> > The ICC both applies the curves you've embedded as well as the
> > linearization curve. So, you just print with a GS image file. I recommend
> > 16 bit Tiff. The image, as I understand the process, goes into the ICC as
> > 16 bit (if RGB it's apparently converted to GS and then, presumably,
> > re-converted back to RGB), the curves within the ICC are applied in high
> > bit mode, and the output is 24 bit RGB to the Epson driver. As long as
> the
> > PS curve you've embedded has it's R, G, and B curves as distinct,
> > non-identical curves, the original 16 bit image data, I would think, is
> > fairly well preserved in the final 24 bit pipeline.
> >
> > (Of course, the printer dithering probably wipes out quite a bit of
> > information, but at least you know you're going to that stage with as
> much
> > as possible.)
> >
> > Paul
> > www.PaulRoark.com
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>  
>


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