QTR-Quadtone RIP

Thanks Eric and Carl.

I'm using UC and Legion photo matte paper.  I started with the included EMM profile.

My questions are:

1.  Do you think 1.4 is a resonble Dmax for this combination?
2.  Does 18% seam like a resonable ink limit for LK?
3.  When printing my test image with my curve vs. the curve included with QTR for 
EEM_warm, my profile lack's contrast relative to the EEM_warm profile.  Any idea why?

The following is some background of what I have done, if you think that you want to check 
my work.  

Carl's comments helped, and I was able to print the ink separation.  This yielded a ink limit 
of 70.  Reprinted, moving the blend slider to 70-30 as suggested by Carl.  I don't have a 
densitometer, so I'm using my scanner with PS reading Lab values for the time being.  The 
interpolated LK ink limit was 18% - does that seem correct?  Next I printed the 21 step 
wedge using the profile I am building (continuing to follow Carl's instructions very 
carefully).

The resulting densities were as follows (Lab values were from PS, and I calculated density 
with John Moody's Excel formula)

	Lab	Density
0%	100	0
5%	93	0.081094474
10%	84	0.193373968
15%	77	0.287925122
20%	72	0.359925951
25%	65	0.467918911
30%	60	0.550933191
35%	57	0.603405387
40%	53	0.676826695
45%	50	0.734742161
50%	47	0.795352319
55%	44	0.858920217
60%	39	0.972285899
65%	36	1.045363937
70%	33	1.122785728
75%	31	1.177080394
80%	30	1.205100473
85%	28	1.263015938
90%	27	1.292968601
95%	26	1.323626096
100%	25	1.355022398

I recieved the error about the values are not increasing, so I moved Grey_lighlights to 10 
(from the default 6), and I moved Grey_shadows to 3 (also from the default of 6).

This resulted in the following

	LAB	Density
0%	99	0.011280447
5%	94	0.069195912
10%	86	0.167573452
15%	79	0.260203152
20%	73	0.345203948
25%	66	0.451932411
30%	61	0.533901792
35%	56	0.621376478
40%	52	0.69584723
45%	49	0.754633898
50%	46	0.816198899
55%	41	0.925749401
60%	37	1.020546359
65%	34	1.096463955
70%	31	1.177080394
75%	30	1.205100473
80%	29	1.233736426
85%	28	1.263015938
90%	26	1.323626096
95%	24	1.387193994
100%	23	1.420180147

I then added this information to the curve definition file, created the curve, and printed the 
21 step with the linearization.  I scanned that, and then plotted the linearized results too.  

I have plotted everything in Tom Moore's speadsheet, and uploaded it in the files section 
called "joshs first curve", if you want to see the plots.

Thanks!

Josh


--- In QuadtoneRIP@yahoogroups.com, Carl Schofield <scho@m...> wrote:
> Calibration files are no longer used with the latest version of QTR.   
> When you print the inkseparation.psd file just set the QTR driver to  
> calibration mode, do not select any curves, and set the blender to  
> 100/0 to print the first calibration target.  After you determine the  
> appropriate ink limit from this target, make the next calibration  
> print with the blend slider set to this new ink limit value.
> 
> Carl
> On Sep 14, 2005, at 11:02 PM, joshhackney wrote: