QTR-Quadtone RIP

--- In QuadtoneRIP@yahoogroups.com, "Michael T. Murphy"
<uriel_bear@...> wrote:
> Did you clear out any existing linerization (from the second to 
> last tab) before trying to linerize now? Otherwise it is similar to
> "double profiling."

The answer to this question is yes, I did clear it out.

Here is the text file from scanning the 21*4 chart:

LGOROWLENGTH	4
CREATED	"7/26/2008"  # Time: 17:42
INSTRUMENTATION	"Eye-One Pro"
MEASUREMENT_SOURCE	"Illumination=D50  ObserverAngle=2° 
WhiteBase=Absolute  Filter=No"
KEYWORD	"SampleID"
KEYWORD	"SAMPLE_NAME"
NUMBER_OF_FIELDS	9
BEGIN_DATA_FORMAT
SampleID	SAMPLE_NAME	GRAY	XYZ_X	XYZ_Y	XYZ_Z	LAB_L	LAB_A	LAB_B
END_DATA_FORMAT
NUMBER_OF_SETS	84
BEGIN_DATA
1	A1	30.00	45.77	46.86	38.55	74.10	1.67	0.15
2	A2	95.00	1.69	1.64	1.27	13.46	2.86	1.07
3	A3	30.00	45.71	46.81	38.47	74.07	1.64	0.20
4	A4	95.00	1.77	1.72	1.36	13.97	2.77	0.73
5	B1	70.00	11.11	11.07	8.17	39.69	3.23	3.47
6	B2	55.00	20.23	20.46	15.85	52.35	2.47	2.45
7	B3	70.00	11.22	11.20	8.35	39.91	3.10	3.21
8	B4	55.00	20.39	20.60	16.01	52.51	2.56	2.34
9	C1	5.00	80.42	83.18	73.50	93.09	0.43	-4.36
10	C2	15.00	64.64	66.74	58.46	85.37	0.65	-3.53
11	C3	5.00	80.15	82.92	73.41	92.98	0.39	-4.48
12	C4	15.00	64.32	66.39	57.97	85.20	0.69	-3.33
13	D1	45.00	29.23	29.68	23.65	61.38	2.35	1.53
14	D2	80.00	5.78	5.68	4.10	28.60	3.50	3.36
15	D3	45.00	29.20	29.68	23.68	61.38	2.24	1.47
16	D4	80.00	5.84	5.74	4.16	28.74	3.47	3.24
17	E1	85.00	3.71	3.60	2.54	22.32	3.65	3.40
18	E2	40.00	34.15	34.79	27.97	65.58	2.12	1.20
19	E3	85.00	3.86	3.76	2.71	22.86	3.50	2.93
20	E4	40.00	34.14	34.78	27.98	65.57	2.13	1.17
21	F1	20.00	57.38	59.14	51.13	81.37	0.89	-2.65
22	F2	0.00	87.34	90.48	80.46	96.20	0.18	-4.91
23	F3	20.00	57.54	59.32	51.15	81.47	0.83	-2.50
24	F4	0.00	87.25	90.39	80.38	96.16	0.19	-4.91
25	G1	60.00	16.81	16.94	12.93	48.18	2.71	2.82
26	G2	65.00	13.91	13.96	10.52	44.17	2.87	3.08
27	G3	60.00	16.93	17.08	13.09	48.36	2.60	2.68
28	G4	65.00	14.05	14.11	10.70	44.39	2.80	2.89
29	H1	100.00	1.43	1.44	1.31	12.23	1.30	-1.58
30	H2	25.00	51.74	53.23	45.10	78.01	1.08	-1.45
31	H3	100.00	1.52	1.53	1.37	12.77	1.34	-1.39
32	H4	25.00	51.90	53.41	45.26	78.12	1.07	-1.46
33	I1	35.00	40.17	41.00	33.39	70.17	2.01	0.63
34	I2	90.00	2.62	2.54	1.87	18.10	3.26	2.24
35	I3	35.00	40.03	40.88	33.20	70.09	1.92	0.77
36	I4	90.00	2.75	2.68	2.00	18.70	3.14	1.90
37	J1	75.00	8.43	8.36	6.14	34.73	3.27	3.34
38	J2	50.00	24.55	24.93	19.66	57.01	2.24	1.87
39	J3	75.00	8.51	8.45	6.24	34.90	3.18	3.17
40	J4	50.00	24.74	25.12	19.91	57.19	2.25	1.67
41	K1	10.00	72.00	74.38	65.80	89.10	0.59	-4.27
42	K2	10.00	72.26	74.66	65.97	89.23	0.58	-4.21
43	K3	10.00	72.21	74.60	65.91	89.21	0.58	-4.20
44	K4	10.00	72.18	74.58	65.94	89.20	0.55	-4.24
45	L1	50.00	24.55	24.90	19.66	56.97	2.38	1.82
46	L2	75.00	8.54	8.47	6.25	34.94	3.31	3.21
47	L3	50.00	24.58	24.97	19.79	57.04	2.17	1.66
48	L4	75.00	8.62	8.55	6.34	35.10	3.36	3.06
49	M1	90.00	2.57	2.49	1.81	17.88	3.31	2.41
50	M2	35.00	40.00	40.86	33.30	70.08	1.88	0.60
51	M3	90.00	2.75	2.68	1.99	18.71	3.21	2.06
52	M4	35.00	39.95	40.78	33.14	70.02	1.98	0.74
53	N1	25.00	51.53	53.02	45.18	77.89	1.07	-1.76
54	N2	100.00	1.41	1.42	1.27	12.10	1.28	-1.38
55	N3	25.00	51.86	53.38	45.26	78.10	1.02	-1.50
56	N4	100.00	1.51	1.52	1.37	12.73	1.37	-1.49
57	O1	65.00	13.99	14.03	10.57	44.27	2.95	3.08
58	O2	60.00	16.96	17.11	13.16	48.39	2.61	2.54
59	O3	65.00	14.08	14.14	10.71	44.43	2.83	2.91
60	O4	60.00	17.29	17.44	13.49	48.81	2.63	2.37
61	P1	0.00	87.03	90.17	80.49	96.07	0.17	-5.15
62	P2	20.00	57.57	59.37	51.45	81.49	0.81	-2.78
63	P3	0.00	87.10	90.24	80.51	96.10	0.17	-5.11
64	P4	20.00	58.10	59.91	51.81	81.79	0.81	-2.68
65	Q1	40.00	34.38	34.97	28.31	65.72	2.28	0.87
66	Q2	85.00	3.93	3.83	2.77	23.12	3.50	2.90
67	Q3	40.00	34.24	34.88	28.18	65.66	2.10	0.98
68	Q4	85.00	4.03	3.94	2.91	23.48	3.30	2.50
69	R1	80.00	5.67	5.56	3.97	28.27	3.66	3.60
70	R2	45.00	29.19	29.69	23.84	61.38	2.18	1.19
71	R3	80.00	5.94	5.85	4.27	29.03	3.37	3.08
72	R4	45.00	29.57	30.07	24.17	61.71	2.21	1.16
73	S1	15.00	63.77	65.78	57.70	84.89	0.79	-3.60
74	S2	5.00	80.09	82.89	73.91	92.97	0.33	-4.94
75	S3	15.00	64.64	66.73	58.51	85.37	0.68	-3.59
76	S4	5.00	80.28	83.07	73.88	93.05	0.36	-4.77
77	T1	55.00	20.40	20.63	16.03	52.54	2.49	2.33
78	T2	70.00	11.50	11.49	8.64	40.40	3.04	2.96
79	T3	55.00	20.48	20.75	16.22	52.67	2.33	2.10
80	T4	70.00	11.51	11.49	8.63	40.39	3.15	2.98
81	U1	95.00	1.68	1.64	1.27	13.50	2.60	1.05
82	U2	30.00	46.22	47.37	39.25	74.42	1.54	-0.24
83	U3	95.00	1.75	1.70	1.30	13.82	2.82	1.20
84	U4	30.00	46.06	47.20	39.02	74.32	1.57	-0.12
END_DATA

I don't think that there are any radical outliers here that would
explain the curve shape.  Here is the linearisation output:

QTR-Linearize-Data version 2.5.2.0
File: C:\Program Files\QuadToneRIP\Eye-One\IS3 Ilf Gls
2880\IS3-ILfGlss-neut-2880-55-UL-out.txt
Step	Dens	Lab	A	B	
0.00	0.044	96.13	0.18	-5.02	-        b                    a          
               L  +
5.00	0.081	93.02	0.38	-4.64	-          b                  |a         
             L    +
10.00	0.128	89.18	0.57	-4.23	-            b                | a       
            L      +
15.00	0.178	85.21	0.70	-3.51	-              b              | a       
          L        +
20.00	0.226	81.53	0.84	-2.65	-                  b          |  a      
       L           +
25.00	0.274	78.03	1.06	-1.54	-                      b      |   a     
     L             +
30.00	0.328	74.23	1.61	-0.00	-                            b|     a   
   L               +
35.00	0.389	70.09	1.95	0.69	-                             | b    a   
L                 +
40.00	0.458	65.63	2.16	1.06	-                             |   b   aL 
                  +
45.00	0.526	61.46	2.25	1.34	-                             |    bL a  
                  +
50.00	0.603	57.05	2.26	1.75	-                             |   L  b a 
                  +
55.00	0.686	52.52	2.46	2.31	-                             |L       b 
                  +
60.00	0.766	48.44	2.64	2.60	-                            L|         b
                  +
65.00	0.852	44.32	2.86	2.99	-                         L   |          b
                 +
70.00	0.947	40.10	3.13	3.16	-                       L     |          
b                 +
75.00	1.073	34.92	3.28	3.19	-                   L         |          
ba                +
80.00	1.244	28.66	3.50	3.32	-                L            |          
 ba               +
85.00	1.422	22.95	3.49	2.93	-            L                |          b
a                +
90.00	1.586	18.35	3.23	2.15	-          L                  |       b  
a                 +
95.00	1.776	13.69	2.76	1.01	-       L                     |   b      a
                 +
100.00	1.831	12.46	1.32	-1.46	-      L                b     |    a   
                    +

LINEARIZE="96.1325 93.0225 89.185 85.2075 81.53 78.03 74.2275 70.09
65.6325 61.4625 57.0525 52.5175 48.435 44.315 40.0975 34.9175 28.66
22.945 18.3475 13.6875 12.4575"


As you can see, it's non-linear towards the black end, but it's not
the worst I've seen.  I'm sure I've linearised this sort of thing before,

F_P