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QPcard™ 201

The QPcard™ 201 is a color chart for calibrating and profiling digital cameras.

Description

The QPcard™ 201 consists of 30 squares of ink applied to a paper substrate in 3 rows of 10 patches. There are 27 unique colors, with the four corner patches consisting of the same gray color. There is a 7 step grayscale. As shown, patches are numbered by rows starting with the upper-left patch. The grayscale occupies patches 4 through 10, inclusive.

The QPcard™ 201 is 140 mm x 41 mm (5.5 x 1.625 in.). A millimeter ruler is printed along one edge. There is an adhesive strip on the back on the side with the ruler, covered with a removable plastic film.

Notes

The ink appears to be silk screen printed onto the substrate.

The paper substrate contains a fluorescent brightener but it does not appear to effect the patches.

The paper substrate is not opaque, making the choice of the backing very important since it can be expected to influence the patches.

Data

  CIE 1976 L*a*b*, D50, 2°
Name L* a* b*
Patch 1
76.62
-0.32
1.17
Patch 2
34.39
3.38
-39.64
Patch 3
85.21
1.91
80.13
Patch 4
25.28
0.30
0.20
Patch 5
39.61
-0.06
0.34
Patch 6
48.95
-0.58
-0.60
Patch 7
65.02
-0.28
0.85
Patch 8
86.61
-0.03
1.60
Patch 9
94.98
-0.14
1.96
Patch 10
76.70
-0.21
1.36
Patch 11
73.39
-17.27
72.02
Patch 12
58.11
-48.93
16.68
Patch 13
51.97
55.96
3.61
Patch 14
28.02
9.70
-6.20
Patch 15
42.14
-14.19
20.08
Patch 16
53.64
1.13
40.59
Patch 17
38.57
13.53
14.02
Patch 18
65.51
17.21
17.88
Patch 19
85.68
-8.33
-1.25
Patch 20
79.55
8.69
-8.58
Patch 21
76.43
-0.21
1.45
Patch 22
36.37
48.66
22.67
Patch 23
53.39
-24.00
-37.20
Patch 24
32.77
28.23
7.78
Patch 25
49.48
-5.17
-21.91
Patch 26
64.38
48.48
63.30
Patch 27
78.44
25.51
83.94
Patch 28
87.71
9.10
27.71
Patch 29
87.43
-4.90
14.43
Patch 30
76.68
-0.28
1.61

Two charts were measured and averaged for the table data. The measurements were made with a GretagMacbeth Spectrolino® equipped with a D65 filter. A black backing was used behind the charts. The spectral data was acquired, averaged and analyzed with SpectraShop™ 2.

Updated 11.4.2007

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