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QTR-Quadtone RIP

Index last updated: 2026-04-28 23:12 UTC

Message

Re: "The Lab values are not in order"

2006-05-16 by Johnny Eades

I looks like you aren't using the random wedge but the 51 step wedge
in even increments of 2%.

Your friend in Photography,

Johnny Eades

--- In QuadtoneRIP@yahoogroups.com, "manni1234atf" <sdicamaro@...> wrote:
>
> Hi,
> 
> printed QTR-51-random wedge, messured with EyeOne Pro Rev b. I've done
> five meassurements and used the average tool in MeasureTool afterwards.
> 
> But when trying to create a curve, I get a "Invalid linearization
> curve - not constantly increasing" error. Why?
> 
> Here are my measurements: Step	Dens	Lab	A	B	
> 0.00	0.027	97.6	1.03	-6.58	-  b                          |   a       
>                L +
> 2.00	0.04	96.48	1.07	-6.23	-    b                        |   a       
>               L  +
> 4.00	0.053	95.39	1.1	-6.34	-   b                         |   a       
>               L  +
> 6.00	0.068	94.06	1.12	-5.91	-     b                       |   a      
>               L   +
> 8.00	0.086	92.55	1.19	-5.5	-       b                     |   a       
>             L    +
> 10.00	0.106	90.93	1.22	-5.54	-      b                      |   a     
>              L     +
> 12.00	0.129	89.07	1.28	-5.09	-        b                    |    a    
>             L      +
> 14.00	0.153	87.15	1.34	-4.59	-          b                  |    a    
>            L       +
> 16.00	0.18	85	1.39	-4.47	-           b                 |    a        
>       L        +
> 18.00	0.208	82.86	1.44	-3.93	-             b               |    a    
>         L          +
> 20.00	0.245	80.14	1.53	-3.28	-               b             |     a   
>        L           +
> 22.00	0.28	77.58	1.58	-3.04	-                b            |     a    
>     L             +
> 24.00	0.313	75.26	1.58	-2.69	-                  b          |     a   
>     L              +
> 26.00	0.341	73.29	1.64	-2.2	-                    b        |     a    
>  L                +
> 28.00	0.382	70.52	1.68	-1.87	-                     b       |     a   
>  L                 +
> 30.00	0.414	68.41	1.68	-1.39	-                       b     |     a   
> L                  +
> 32.00	0.453	65.96	1.75	-0.83	-                         b   |      a L
>                    +
> 34.00	0.496	63.28	1.85	-0.48	-                           b |      a  
>                    +
> 36.00	0.518	61.93	1.84	-0.37	-                           b |      a  
>                    +
> 38.00	0.577	58.52	1.94	0.45	-                             |b   L a   
>                   +
> 40.00	0.622	55.94	1.96	0.67	-                             | bL   a   
>                   +
> 42.00	0.652	54.32	1.96	0.85	-                             | Lb   a   
>                   +
> 44.00	0.675	53.11	1.98	0.97	-                             |L b   a   
>                   +
> 46.00	0.72	50.74	2.02	1.2	-                             L   b   a    
>                 +
> 48.00	0.745	49.48	2	1.29	-                            L|    b  a     
>                +
> 50.00	0.781	47.7	2.04	1.53	-                           L |     b a   
>                  +
> 52.00	0.846	44.62	2.03	1.95	-                         L   |      ba  
>                   +
> 54.00	0.871	43.44	2.01	1.91	-                         L   |      ba  
>                   +
> 56.00	0.918	41.36	2.06	2.21	-                       L     |       b  
>                   +
> 58.00	0.984	38.52	2.06	2.55	-                      L      |       a b
>                   +
> 60.00	0.992	38.19	2.02	2.3	-                     L       |       ab  
>                  +
> 62.00	1.033	36.49	2.04	2.5	-                    L        |       a b 
>                  +
> 64.00	1.089	34.29	2.01	2.57	-                   L         |       a b
>                   +
> 66.00	1.102	33.79	1.95	2.51	-                   L         |      a  b
>                   +
> 68.00	1.138	32.43	2	2.63	-                  L          |       a b   
>                +
> 70.00	1.2	30.19	1.95	2.72	-                 L           |      a  b  
>                 +
> 72.00	1.24	28.78	1.87	2.77	-                L            |      a   b
>                  +
> 74.00	1.287	27.2	1.77	2.62	-               L             |      a  b 
>                  +
> 76.00	1.347	25.24	1.79	2.88	-              L              |      a   b
>                  +
> 78.00	1.36	24.85	1.73	2.53	-             L               |     a   b 
>                  +
> 80.00	1.416	23.14	1.54	2.66	-            L                |     a   b
>                   +
> 82.00	1.457	21.9	1.49	2.68	-            L                |    a    b 
>                  +
> 84.00	1.473	21.44	1.37	2.46	-           L                 |    a   b 
>                   +
> 86.00	1.492	20.9	1.33	2.35	-           L                 |    a   b  
>                  +
> 88.00	1.524	20.02	1.28	2.56	-           L                 |    a    b
>                   +
> 90.00	1.533	19.77	1.23	2.43	-          L                  |   a    b 
>                   +
> 92.00	1.553	19.21	1.19	2.32	-          L                  |   a    b 
>                   +
> 94.00	1.569	18.8	1.09	2.33	-          L                  |   a    b  
>                  +
> 96.00	1.571	18.74	0.95	2.16	-          L                  |  a    b  
>                   +
> 98.00	1.571	18.73	0.83	2.2	-          L                  |  a    b   
>                  +
> 100.00	1.572	18.72	0.71	1.93	-          L                  | a    b  
>                    +
> 
> LINEARIZE="97.6 96.48 95.39 94.06 92.55 90.93 89.07 87.15 85 82.86
> 80.14 77.58 75.26 73.29 70.52 68.41 65.96 63.28 61.93 58.52 55.94
> 54.32 53.11 50.74 49.48 47.7 44.62 43.44 41.36 38.52 38.19 36.49 34.29
> 33.79 32.43 30.19 28.78 27.2 25.24 24.85 23.14 21.9 21.44 20.9 20.02
> 19.77 19.21 18.8 18.74 18.73 18.72"
>

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