QTR-Quadtone RIP

--- In QuadtoneRIP@yahoogroups.com, "Paul Roark" <paul.roark@...> 
wrote:
>
> Colin,
> 
> ...
> >In order to 
> >print the step wedge using this file I also copied your original 
> >quad file and gave it the same name as the qidf file. 
> >Was this correct?
> 
> I don't think so.  My original *.quad file would have the 
linearization data
> reflected in it, I believe.  If you'd saved the *.qidf file with 
the
> linearization data removed, it'd make a new quad file.  This new 
file is
> what should have been used for linearization.  On the other hand, 
if you
> saved the new qidf file, it probably overwrote the old quad file.
> 
> >I printed the unlinearized step wedge and, 
> 
> Maybe it was unlinearized -- maybe not if my original quad file 
was still
> there and unaltered.
> 
> Paul
> www.PaulRoark.com
>
Paul,

I must apologize that I am so dense but I cannot seem to get this 
right and my ignorance is at the root of this.  For example I don't 
know what the QUAD file is, what it is for, how it works, nor that 
it is important that I should.

If I take the QIDF file, strip it of the linearized points in 
notepad and save it with another name, the saved file is a txt 
file.  So I copy the QIDF file copy it and rename it and then strip 
out the linearized points and save it.  If I then press the show 
curve button and save it, no quad file of the same name is produced.

I need a QUAD file for Curve 1 in Curve Setup.  Using `none' yields  
an error message regarding the qdensity.

I have tied various QUAD files as models, the latest being 3MK-
Start.  But this, presumably, was designed for the third Eboni in 
the Glop position, not in the yellow position.  

I therefore investigated the MK-Start QUAD file, copied it, renamed 
it to be the same as the first part of the QIDF file.  I then put 
all the numbers in the GLOP part of that QUAD  file over the zeros 
in the yellow part of the file.  I then copied all the zeros in the 
red part of the file and copied them over the Glop numbers.  I then 
used this file in Curve Setup.

The resulting file, after relinearization was a significant 
improvement over what had been achieved before, but still not linear 
although Dmax is 1.75, as follows:

Equal Steps	L
95.54	95.54
91.57	92.26
87.60	89.43
83.63	86.02
79.66	82.60
75.69	78.81
71.72	75.13
67.75	71.03
63.78	67.17
59.81	63.10
55.84	58.84
51.86	54.12
47.89	49.34
43.92	44.63
39.95	39.90
35.98	34.37
32.01	29.33
28.04	24.68
24.07	20.92
20.10	18.06
16.13	16.13
I tried using the Ink Limit and Gamma sliders but without success 
and the Dmax worsened.  Have you any suggestions to generating the 
Quad file properly and getting a linear result?

Colin