QTR-Quadtone RIP

Keith,

go off and read this and then if you have further questions come back and
ask...

http://www.diallophotography.com/pdfs/QTRworkflow.pdf

<http://www.diallophotography.com/pdfs/QTRworkflow.pdf>Mike

On 14 September 2010 21:49, Keith <kjrslr@...> wrote:

>
>
> Thanks Mike. You are being VERY helpful.
> Still have questions.
> First.
> For the intial Calibration page I printed, I determined that max ink to be
> 73%. What should I have been looking for from my measurements(w/Spyder3Print
> spectro) Lab or density? In other words, which should I use and what change
> should I see, number wise? I think I used the numbers I got from density
> readout.
>
> Next, Since I determined 73 was the point, I put that into the slider and
> printed out a new Calibration page to get the limit for the LK which I
> determined was 25% of Blk.
> So the Calibration page(set at 73)was printed out I read the 100% patch for
> LK. The reading I got for Density was .88 and L was 42.96.
> I then measured Blk and found the 25% patch read Density at .88 and L was
> 42.81.
> Should I have printed out a 3rd Calbration page with the slider set to 25
> to detrmine the LLK as I did to get the LK?
> The reason I ask is that the existing curve I used had the LK at 22.8 and
> LLK at 7.6 where as what I measured I got for LK was 25% but LLK was 31%,
> but I only printed out just the 2 calibration pages(the 1st and then 73%).
> Because the 31% seemed too high(compared the existing curve) I wondered if I
> should have printed a 3rd page for determining the % of LLK from LK. Do you
> follow my question?
>
> To answer your question as to which strip, I'm refering to the one printed
> out(following the instuctions you mention)after I put in the numbers from
> the Calibration page(which determine ink limits).
>
> You're answering a lot Mike, please keep it up!
>
> --- In QuadtoneRIP@yahoogroups.com <QuadtoneRIP%40yahoogroups.com>,
> Michael King <drmrking@...> wrote:
> >
> > Hi Keith,
> >
> > >>So correct me if I'm wrong. Are you saying that when I called up the
> > existing curve to modify, I should have removed the >>linearization
> first,
> >
> > Yes
> >
> > >>THEN added the numbers I got from the ink calibration into the Curve
> > Creator box, AND THEN print that(the >>21 step wedge)out?
> >
> > Yes
> >
> > >>Do I then measure this new strip and put those numbers in the
> > linearization boxes?
> >
> > Yes
> >
> > >>If the strip doesn't >>look good, what do I modify next?
> >
> > Which strip?
> >
> > So after the above, you effectively have a print path that prints linear
> L
> > vs RGB value.
> > Now the question is how are you going to map what you see on your monitor
> to
> > this print path?
> > Since you have a spectro and the final linerized target already printed,
> I
> > would suggest that you create an QTR RGB ICC profile and use that to soft
> > proof your images in photoshop - with preserve values checked. This gives
> > luminance and "colour" soft proof.
> >
> > Also you can use one of the ICCs in QuadToneRIP/icc to soft proof. This
> will
> > give you approx luminance.
> >
> > Mike
>
>  
>


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