Aiming at the characteristics of traditional camouflage spot colors, the shortcomings of the artificial color matching method are pointed out, and the implementation method and steps of using the computer color matching software mKbri to carry out computer color matching on the collected background colors are explained, and the obtained formula is corrected to obtain the same The spectral reflectance curves of the formulas with basically the same background color are listed in the CIELab chart. It can be seen from the comparison that they basically achieve the same spectrum and color, which meets the camouflage requirements in the visible light band.
The traditional camouflage spots mainly rely on the method of artificial color adjustment to determine the color of the camouflage spots. The determination of the color of the camouflage spots ignores the difference in the hue and saturation of the background to a certain extent, and the color is simply determined according to the difference in brightness. Definitely. And these methods require color matching personnel to have rich color matching experience, and the deployment time is long, which also causes waste of raw materials. In terms of hue and saturation, the spot color determined by these methods is quite different from the background. In order to To solve this problem, based on the colibri color matching software, the author precisely adjusts the color of the camouflage spots, and corrects the obtained formula. The experimental data shows that this method has high accuracy for the color matching of the camouflage spots. On the basis of spectrum, try to achieve the same color and spectrum.
1 color matching
When color matching is carried out according to the steps of collecting background color and computer color matching. When collecting background color, the background color is mainly measured by CM-2500d Spectrophotometer , and then the characteristic parameter value of the background color is obtained, and then the collected background color The color characteristic parameter values are input into the cnlibri color matching software installed in the computer, and the measured characteristic parameter values are calculated to obtain the color scheme of the background color.
1.1m set background color
The color of the camouflage spots needs to match the color of the main background spots in the target activity area. Select the more representative medium green and earthy yellow backgrounds, and use the CM-2500d Spectrophotometer to collect the two colors of medium green and earthy yellow respectively. The acquisition process is as follows: taking the medium green as an example, use a Spectrophotometer to measure at different positions of the background medium green area (8 different positions were selected in this experiment) to obtain the data of each measurement. After more than 2 measurements , the computer will display the average deviation of the measurement, one of which is always the "worst value". Representative medium green and earthy yellow
For the background, use the CM-2500d Spectrophotometer to collect the two colors of medium green and khaki respectively. The collection process is as follows: taking the medium green as an example, use the Spectrophotometer at different positions of the medium green area of the background (this paper The experiment selected 8 different positions), measured separately, and obtained the data of each measurement. After more than 2 measurements, the computer will display the average deviation of the measurement, and one of them is always the "worst value". After repeated deletion "Worst value", and finally there is a "better value", which is the collected background spot color data. The collection results are shown in Figure 1 and Figure 2.
1.2 Computer color matching
When measuring color, since the Spectrophotometer has been connected , the data does not need manual processing, and will be displayed directly after software processing. Then use the color matching function of the software to calculate the measured color , and obtain the spectral curve comparison and The formula and curve comparison are shown in Figure 3, and the formula is shown in Table 1. The color matching uses PowderCoating colorant series. PowderCoating is a kind of resin, which occupies a large proportion in the obtained formula . This colorant series consists of 18 colorants Composed of 8 kinds of black and white pigments.
2 Recipe revision and conclusion
Because in the process of collecting the background color, especially through manual collection, there will inevitably be errors. In addition, there are errors between the calculated color scheme and the background color. Therefore, after the initial formula is calculated, the initial formula must be corrected. You can apply The correction function in the colibri software completes this step.
From the comparison of the spectral reflectance curves in Figure 3, it can be seen that the reflectance of the spectral reflectance curve of the medium-green formula at each wavelength is higher than that of the medium-green at the same wavelength, especially in the 500-700nm green It is especially obvious in the band. Therefore, when correcting, it is necessary to add an appropriate amount of Black756UAX pigment (0.002%) to reduce the reflectivity. After adding the black effect pigment, the reflectivity of the 600~700nm band is too low, and it is necessary to add an appropriate amount of GLNGI•eenIR-GALITE( 0.0023%) and a small amount of YelbwPALIOTOL pigment (0.024%) to try to reduce the difference between the two curves. After correction, the spectral reflectance curve of the mid-green modified formula is compared with the mid-green spectral reflectance curve and the quality control color difference radar chart is shown in Figure 4. The spectral reflectance curve of the khaki formula is not very different from that of the khaki. The main difference is concentrated between 400~430nm and 660~700 nm. It needs to add 0.001% of 8!^14 people and black effect Pigment and 0.001% YellowIRGALITE coloring agent, and reduce 0.001% RedIron coloring agent, then after correction, the correction formula of khaki and the spectral reflection curve of khaki are compared 3, the formula is shown in Table U, the color matching adopts PowderCoating coloring and quality control color difference radar The graph is shown in Figure 5.
Due to the limited types of pigments and colorants in the software database, the effect is not very satisfactory for medium green in the 400~540nm band, and this part will be further improved with the increase of colorant types in the database.
curves, and then compare the spectral reflectance curve of the background color with the spectral reflectance curve of the revised formula. The results show that the revised spectral reflectance curve is closer to the spectral reflectance curve of the background color, basically achieving the same color and spectrum. Moreover, it can also be found from the two radar images that the color difference between the formula color and the background color is very small, especially in terms of hue and saturation, which overcomes the shortcomings of the traditional spot color determination method.
3 Epilogue
The determination of the traditional camouflage spot color depends on manual color matching, which is not only expensive but also wastes fabrics and dyes, the color difference between the color and the background color is unstable, and the effect has a lot to do with the experience of the color matching personnel. Based on Colibri The camouflage spot color reproduction technology of the color matching software can overcome the above shortcomings, improve the color matching efficiency, and also greatly improve the color matching accuracy.
