QTR-Quadtone RIP

Thats an easy problem to fix by printing on a more normal paper now I have my exposure right. 


QTR-Linearize-Data gave a curve for digital negatives but when I paste it into the linearisation panel of the windows interface and try to save it, I get an error message, curve creation failed, values not constantly increasing. I do not get this message with the normal linearisation output of QTR-Linearize-Data.I made a workaround by normalising the negative linearisation data and using it in a grey curve, but ideally would like to be able to make the L* data work if possible. If I try and put the negative linearisation data directly into a .qidf file I believe I have the same problem. Any help apreciated.  


Thanks
David



________________________________
 From: Roy Harrington <roy@...>
To: QuadtoneRIP@yahoogroups.com 
Sent: Thursday, 29 March 2012 5:28 AM
Subject: Re: [QuadtoneRIP] QTR-Linearize-Data
 

  
That was a strange outcome.
The problem is that without headings the code "guesses" what column is what.
One of the criteria is that L has a value above 90 -- and yours goes only to 87.
Anyway the easy fix is to add the heading line:

L A B X Y Z

This will make it clear that the first column is L.

Roy

On Wed, Mar 28, 2012 at 3:28 AM, 228044881 228044881
<cheesecraft@...> wrote:
> Right, I see if I trim all data from the file except L* it works and gives me a linearised curve and a curve for digital negatives too.
>
> Thanks
> David
>
>
>
> ________________________________
>  From: "cheesecraft@..." <cheesecraft@...>
> To: QuadtoneRIP@yahoogroups.com
> Sent: Wednesday, 28 March 2012 9:31 PM
> Subject: [QuadtoneRIP] QTR-Linearize-Data
>
>
>
> When I drop the following file onto QTR-Linearize-Data it tells me:
> The Lab values are not in order.
> Cannot be linearized.
> Yet that are in sequence in the input file. I am not shure how to make this work.
> I am trying to make a profile for digital negatives for carbon prints, measured using an i1 and ColorPort using Scott Martins article at http://www.on-sight.com/2012/02/22/using-colorport-for-qtr-grayscale-and-alt-process-measurement-and-profiling/
> Paper base is a little more off white than usual beacuse I am fine tuning stuff with reject pearlescent hand sized paper and just trying to make the process work before printing a final wedge.
>
> Thanks
> David
>
> 87.76   0.52    8.66    69.25   71.56   50.89
> 81.92   0.63    8.29    58.28   60.16   42.68
> 72.84   0.97    7.07    43.65   44.92   32.17
> 62.57   1.19    7.11    30.29   31.08   21.82
> 58.08   1..50   6.84    25.47   26.05   18.22
> 53.62   1.55    7.04    21.18   21.62   14.88
> 48.19   1.73    6.97    16.65   16.94   11.50
> 44.75   1.75    6.98    14.13   14.37   9.64
> 40.81   1.85    6.85    11.59   11.75   7.80
> 37.92   1.93    6.57    9.93    10.04   6.65
> 33..73   1.97    6.29    7.81    7.88    5.17
> 30.11   1.87    5.63    6.23    6.28    4.16
> 27.76   1.77    4.99    5.33    5.37    3.61
> 24.09   1.60    4.47    4.09    4.13    2.79
> 22.88   1.45    3.42    3.73    3.76    2.65
> 20.16   1.19    2.68    2.99    3.03    2.19
> 19.16   0.97    1..86    2.74    2.79    2.09
> 18.46   0.74    1.22    2.57    2.62    2.03
> 15.62   0.65    0.64    1.98    2.03    1.61
> 14.29   0.46    0.23    1..74    1.78    1.45
> 13.99   0.32    0.03    1.68    1.73    1.42
>
> QTR-Linearize-Data version 2.7.2.0
> File: D:\Pictures\Digital Negatives\TAB-out...txt
> Step    Dens    Lab     A       B
> 0.00    0.320   74.74   0.00    0.00    -                             b             L               +
> 5.00    0.460   65.49   0.00    0.00    -                             b        L                    +
> 10.00   0.520   61.83   0.00    0.00    -                             b      L                      +
> 15.00   0.630   55.53   0.00    0.00    -                             b  L                          +
> 20.00   0.650   54.44   0.00    0.00    -                             b L                           +
> 25.00   0.740   49.73   0.00    0..00    -                            Lb                             +
> 30..00   0.970   39.10   0.00    0.00    -                      L      b                             +
> 35.00   0.970   39.10   0.00    0.00    -                      L      b                             +
> 40.00   1.190   30.54   0.00    0.00    -                 L           b                             +
> 45.00   1.190   30..54  0.00    0.00    -                 L           b                             +
> 50..00   1.450   22.12   0.00    0.00    -            L                b                             +
> 55.00   1.500   20.68   0.00    0.00    -           L                 b                             +
> 60.00   1.550   19.30   0.00    0.00    -          L                  b                             +
> 65.00   1.600   17.97   0.00    0..00    -         L                   b                             +
> 70.00   1.730   14.75   0.00    0.00    -       L                     b                             +
> 75.00   1.750   14.28   0.00    0.00    -       L                     b                             +
> 80.00   1.770   13.82   0.00    0.00    -       L                     b                             +
> 85.00   1.850   12.04   0.00    0.00    -      L                      b                             +
> 90.00   1.870   11.61   0.00    0.00    -     L                       b                             +
> 95.00   1.930   10.37   0.00    0.00    -     L                       b                             +
> 100.00  1.970   9..57   0.00    0.00    -    L                        b                             +
>
> The Lab values are not in order.
> Cannot be linearized.
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

-- 
Roy Harrington
roy@...
www.harrington.com

 

[Non-text portions of this message have been removed]