QTR-Quadtone RIP

Hallo,

i suppose the reason is the Lab value for 85% which is smaller than the 
value for 90%. I had the same experience today, when i tried to 
linearize curves for moab kayenta. I happens, when you draw your EyeOne 
not very continous over the printed stepwedge. I tried again two or 
three times and then the result was ok.

Regards

Rainer


lours51 wrote:

> First I would like to thank Tom Husband for his reply to my previous
> post.
>
> Now I don't manage to linearize the curve.
> Details :
> I am on WindowsXP, QTR 2.30, Epson 4000, ink Mis UT7, Paper Epson
> Semi-Gloss, Eye1 Photo.
>
> I printed the "Ink Pattern Page" in calibration mode with 40%,
> scanned it in color 48bits 400dpi. In PS with eyedroper (5x5)I read
> the 100%value of each ink, compared it to the Black and read on the
> pattern the corresponding percentage.
> In QTR I recorded these values under "Density" in the "curves
> creator" window and "ink setup" tab. Black being 100% C=52, M=73,
> Y=27, LC=22, LM=19, LK=37
> Then I printed, not under calibration mode, the stepwedge 21 random
> and read the values with the Eye1. I saved the file and droped it
> into the Linearizing EXE and got this file :
> Step      Lab      A      B     
> 0.00      93.56      -0.75      -5.01      -        b                 a 
> |                         L   +
> 5.00      80.45      0.29      -1.03      -                        b   
> |a                L           +
> 10.00      67.45      1.07      2.05      
> -                             |  
> a   b L                   +
> 15.00      56.78      1.73      3.66      
> -                             |   L
> a       b               +
> 20.00      48.02      2.13      5.06      -                           L
> |       a           b         +
> 25.00      41.62      2.47      5.77      -                       L    
> |        a             b      +
> 30.00      35.15      2.71      6.05      -                    L       
> |         a             b     +
> 35.00      29.92      2.69      5.48      -                L           
> |         a          b        +
> 40.00      26.05      2.52      4.60      -              L             
> |         a       b           +
> 45.00      23.34      2.25      3.73      -             L              
> |        a    b               +
> 50.00      20.49      1.92      2.49      -           
> L                 |     
> a b                    +
> 55.00      19.27      1.72      1.88      -          
> L                  |    
> ab                      +
> 60.00      17.68      1.15      0.69      -         
> L                   | b
> a                         +
> 65.00      16.98      1.13      0.24      -         
> L                   b  
> a                         +
> 70.00      16.52      0.82      -0.27      -        L                  
> b | 
> a                          +
> 75.00      15.89      0.33      -1.26      -        L              b    
> |a                            +
> 80.00      15.71      0.12      -1.75      -        L             b     
> a                             +
> 85.00      15.44      -0.24      -1.87      -        L            b     
> a|                             +
> 90.00      15.62      -0.29      -2.06      -        L           b      a
> |                             +
> 95.00      15.37      -0.52      -2.50      -        L          b      a 
> |                             +
> 100.00      15.29      -0.60      -2.67      -        L         
> b       a 
> |                             +
>
> LINEARIZE="93.56 80.45 67.45 56.78 48.02 41.62 35.15 29.92 26.05
> 23.34 20.49 19.27 17.68 16.98 16.52 15.89 15.71 15.44 15.62 15.37
> 15.29"
>
> I then filled the linearization grid starting with the smallest
> value of 15.2 and carried on in the following order with 15.37 and
> so on.
>
> I clic to create the curve, answer "Yes" to "save ink description"
> and got this message " Invalid Linearize curve - not constantly
> increasing - Curve creation failed ".
>
> I understand that the ink densities values are not in a decreasing
> order, supposing there is one, but what to do ? That's the values I
> have !
> Or is it something else I am doing wrong ?
>
> I will be very greatful to and helpful hand.
>
> Michel
>
>
>
>
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