QTR-Quadtone RIP

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






On 14 September 2010 20:35, Keith <kjrslr@...> wrote:

>
>
> Here's what I did:
> Printed the Calibration page(the one with all the colors).
> Measured the black ink and determined max ink to be 73%.
> Printed Cal page again with the ink calibration slider at 73.
> Determined 100% LK was 25% of Blk and 100% LLK was 31% of LK.
> Called up an existing curve to modify.
> I modified the existing numbers using what I got from the above, changing
> the Default ink limit to 73, Blk to 100(density)/70(limit), LK to 25/70 and
> LLK to 31/70. I kept the limits the same from the curve I modified. I then
> printed out another wedge and determined that the the LLK was off(the 31)
> and went back to what the original LLK was(7.6/70). I kept modifying the
> curve and printed a wedge until I saw an even distribution of tones on the
> wedge. I did not change the linearization at any point until I was done.
> 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,
> THEN added the numbers I got from the ink calibration into the Curve Creator
> box, AND THEN print that(the 21 step wedge)out? Do I then measure this new
> strip and put those numbers in the linearization boxes? If the strip doesn't
> look good, what do I modify next?
> Keith
>
>
>
> --- In QuadtoneRIP@yahoogroups.com <QuadtoneRIP%40yahoogroups.com>, Mike
> King <drmrking@...> wrote:
> >
> > Keith just to be clear, you have to remove the linearization first then
> generate new curve, print your wedge then put the new linearzation in, then
> generate your final curve set. Is that what you did? mike
> >
> >
> >
> > On 14 Sep 2010, at 16:07, "Keith" <kjrslr@...> wrote:
> >
> > > Yes I did remove the 51 and replaced them with the 21. When I printed
> out the step wedge with the new linearizion numbers, the wedge, instead of a
> nice gradation, was now mostly black from about 100% to
> > > 70%, then the gradation was slight for the remainder. At that point I
> thought I had done something wrong and replaced the 21 with the original 51.
> > > To surmise: I have printed out a step wedge with a nice gradation, took
> measurements(Spyder3Print), placed the numbers in the linearizion
> box(replacing 51 with 21) and printed out a wedge with a mostly dark
> gradations. What did I do wrong? What do I do next?
> > >
> > > --- In QuadtoneRIP@yahoogroups.com <QuadtoneRIP%40yahoogroups.com>,
> Howard Shaw <glassman@> wrote:
> > > >
> > > > You haven't mentioned linearisation - did you remove the
> linearisation
> > > > figures from the existing curve and replace them with your own?
> > > >
> > > > regards
> > > > Howard
> > > >
> > > > On 14/09/2010 04:52, Keith wrote:
> > > > > Backgound:Windows Vista, calibrated monitor, Epson 4800, modified
> ConeColor inkset(LK and LLK are Cone Selenium shades 4& 5). I printed out
> the calibration page. Determined ink limit,etc. Selected an exisiting curve
> to modify to determine tone,etc. In curve creation, I modified density and
> limits and printed out 21 step wedge after step wedge to get a nice, evenly
> graduated step wedge. After many iterations,I thought I had made a good
> neutral curve. I pulled up an image in PS and made sure it was a greyscale
> tiff, gamma 2.2 image. I then opened it in QTR, selected my curve and hit
> print. The tone was neutral but the print was light. What did I do wrong?
> http://docs.yahoo.com/info/terms/
> > > > >
> > > > >
> > > > --
> > > >
> > > > Howard Shaw
> > > > glassman@
> > > > www.howardshaw.org
> > > >
> > >
> > >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>  
>


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