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Education/Training
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Standardization of reproduction of Remote Sensing
images and its quality control system
After analyzing data in table 1 it can be pointed out.
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The vertical and horizontal directions of scanning systems produce different dimensional distortion and the distortion in vertical direction appears quite stable in range of magnification from 1* to 8*
- Consideration of tolerance margins in reproduction of remote sensing images the DC- 300 B scanner can provide the acceptable geometric accuracy until 6*, while the M550 scanner can be used till 4*.
- No spherical distortion in scanning systems has been found.
Standarization and specfication for reproduction.
In order that a set of original separations and proofs may be produced and can easily be matched it is necessary to specify the following parameters:
- Computations of CIE Uniform space coefficients of ink sets-2 The results of measurement are shown in Table-2
Table 2
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Colours | Ds | Tristimulus Values |
Uniform Colour Space |
| X | Y | Z | L* | a* | b* |
| Yellow | 1.03 | 62.14 | 67.28 | 10.54
| 85.65 | -7.54 | 85.37 |
| Magenta | 1.40 | 32.99 | 18.35 | 34.40
| 49.92 | 64.53 | -19.67 |
| Cyan | 1.50 | 21.80 | 28.88 | 7.37 | 60.68
| -26.81 | -39.68 |
| Black | 1.62 | 5.48 | 5.51 | 7.10 |
28.14 | 1.40 | -2.68 |
- The data of colour cast grayness and color efficiency of inks are given Table 3
Table 3.
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Colours | Solid Density |
Colour
Cast | Grey | Efficiency |
| R | G | B |
| Yellow | 0.04 | 0.09 | 1.06 | 5% | 40% | 94% |
| Magenta | 0.20 | 1.40 | 0.74 | 45% | 14% | 66% |
| Cyan | 1.54 | 0.51 | 0.18 | 25%
| 10% | 78% |
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Colorimetric measurements of map Paper The densitometric and spectrophotometric data of coated paper are listed in Table 4
Table 4.
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Paper | Weight
(g m2) | Solid Density |
Uniform Colour Space |
| R | G | B | L* | a* | b* |
| Coated | 157 | 0.07 | 0.01 | 0.04 | 97.26
| -1.73 | -1.21 |
- Determination of print contrast. The print contrast is limited to 0.3 ±0.03 for yellow, 0.35±0.03 for magenta, 0.35±0.03 for cyan and 0.4±0.03 for black.
- Determination of color contrast. It is 70±5% for yellow colour ,50± 5% for magenta and 55% ±5% for cyan.
- Determination of optimum ink level. The optimum ink level are defined by the maximum values of print contrast and colour contrast. The control data is 1.05±0.03 for yellow, 1.40± 0.03 for magenta 1.50±0.03 for cyan and 1.60±0.03 for black.
- Investigation of dot gain The actual control data of dot gain is 11%±2%.
- Printing ink sequence. In our case the printing sequence is black, cyan, magenta and yellow.
- trapping determination . the control data is 110%±3% for cyan+ magenta " combination. 105%±3% for "cyan+ yellow" combination, 106%±3% for "magenta+ yellow" combination and
112%± 3% for "cyan+ magenta+ yellow" combination.
- Determination of grey balance. The grey balance is determined by either colour atlas or mathematical calculation. In our case the grey balance data are shown in table 5
Table 5.
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Set A | Set B |
| Density | Cyan | Magenta | Yellow |
Density | Cyan | Magenta | Yellow |
| 1.37 | 100 | 90% | 85% | 1.33 |
100 | 90% | 85% |
| 0.79 | 70% | 55% | 51% | 0.83 | 70% | 62% | 55% |
| 0.49 | 50% | 35% | 30% | 0.59 | 50% | 45% | 40% |
0.28 | 32% | 20% | 15% | 0.35 |
32% | 28% | 24% |
| 0.14 | 16% | 12% | 9% | 0.19 | 16% | 14% | 12% |
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